This is just a timeline of background information which I feel is important/semi-important for the story. I will warn you, I don't know when to quit, so this "timeline" is a bit lengthy and is sorta detailed.

*****

T I M E L I N E

17 March 1973 ( Sat. )
• Mycroft Holmes is born at
Hexham General Hospital
in Hexham,
Northumberland to Violet
and Siger Holmes [seven
years before Sherlock;
eight years before Eurus]

8 April 1975 ( Tues. )
• John Watson is born at
Broomfield Hospital in
Chelmsford, Essex

September 1976
• 3-year-old Mycroft Holmes
starts preschool [begins
Nursery at the private
Mowden Hall School in
Stocksfield,
Northumberland]

September 1978
• 5-year-old Mycroft Holmes
starts primary school
[begins Year 1 at the
private Mowden Hall
School in Stocksfield,
Northumberland]

6 January 1980 ( Sun. )
• Sherlock Holmes is born at
Hexham General Hospital
in Hexham,
Northumberland to Violet
and Siger Holmes [seven
years after Mycroft; one
year before Eurus]

1 February 1981 ( Sun. )
• Eurus Holmes is born at
Hexham General Hospital
in Hexham,
Northumberland to Violet
and Siger Holmes [eight
years after Mycroft; one
year after Sherlock]

September 1983
• 3-year-old Sherlock Holmes
starts preschool [begins
Nursery at the private
Mowden Hall School in
Stocksfield,
Northumberland]

September 1984
• 11-year-old Mycroft Holmes
starts secondary school
[begins Year 7 at the
private Mowden Hall School
in Stocksfield,
Northumberland]
• 3-year-old Eurus Holmes
starts preschool [begins
Nursery at the private
Mowden Hall School in
Stocksfield,
Northumberland]

September 1985
• 5-year-old Sherlock Holmes
starts primary school
[begins Year 1 at the
private Mowden Hall School
in Stocksfield,
Northumberland]

Early May 1986
• Eurus burns down the
Holmes family mansion —
Musgrave Hall [which was/
is located in a small village
just north of the commuter
village of Stocksfield in the
south of the English
ceremonial county of
Northumberland, a bit west
of Newcastle upon Tyne]

Mid May 1986
• Eurus is taken away

Late May 1986
• The Holmes family moves
slightly east, moving into
a townhouse near the
centre of Newcastle in the
metropolitan county of
Tyne and Wear

September 1986
• 13-year-old Mycroft Holmes
is transferred to another
school [begins Year 9 at
the public Heaton Manor
School in Newcastle]
• 6-year-old Sherlock Holmes
is transferred to another
school [begins Year 2 at
the public Cragside
Primary School in
Newcastle]

August 1987
• The Holmes family moves
to the south of England,
moving into a large
cottage in the Oxfordshire
Cotswolds village of
Ardingsby

September 1987
• 14-year-old Mycroft Holmes
is sent to boarding school
[begins Year 10 at the
public-independent all-
boys Harrow School in
Harrow on the Hill,
Greater London]
• 7-year-old Sherlock Holmes
is transferred to another
school [begins Year 3 at
the public Ardingsby Day
School]

September 1988
• 8-year-old Sherlock Holmes
is sent to boarding school
[begins Year 4 at the
private Dragon School in
Oxford]

7 October 1988 ( Fri. )
• Natália Kertész is born at
the University of Debrecen
   Clinical Centre – Kenézy
   Gyula Campus in
Debrecen, Hungary to
Vivien and Nikolasz Kertész

Early 1989
• Carl Powers dies

January 1991
• The Kertész family moves
from Debrecen to the
Hungarian capital of
Budapest, moving into a
large townhouse near the
city centre

September 1991
• 18-year-old Mycroft Holmes
starts university
• 11-year-old Sherlock
Holmes starts secondary
school [begins Year 7 at
the private Dragon School
in Oxford]
• 2-and-a-half-year-old
Natália Kertész starts
preschool [begins Nursery
at the private A-Z
International Centre for
Children in Budapest]

September 1993
• 13-year-old Sherlock
Holmes is transferred to
another boarding school
[begins Year 9 at the
public independent all-
boys Harrow School in
Harrow on the Hill, Greater
London]

August 1994
• The Kertész family
temporarily moves to
Berne in western
Switzerland for Natália's
dad's job
• 5-and-a-half-year-old
Natália Kertész starts
primary school [begins
Kindergarten at the private
International School of
Berne]

May 1995
• 22-year-old Mycroft Holmes
graduates from the
University of Oxford

June 1998
• The Kertész family moves
back to Budapest, Hungary

September 1998
• 18-year-old Sherlock
Holmes starts university
• 9-and-a-half-year-old
Natália Kertész is
transferred to another
school [begins Grade 4 at
the public Erzsébet Eötvös
Primary School in
Budapest]

13 June 1999 ( Sun. )
• Natália Kertész's mother,
Vivien, dies

September 2000
• 11-and-a-half-year-old
Natália Kertész is
transferred to another
school [begins Grade 6 at
the public Virág Asztalos
Lower Secondary School
in Budapest]

June 2002
• 22-year-old Sherlock
Holmes graduates from
the University of
Cambridge, having
obtained both a Bachelor's
degree and a Master's
degree

September 2002
• 13-and-a-half-year-old
Natália Kertész is
transferred to another
school [begins Grade 8 at
the private International
School of Budapest]

September 2005
• 16-and-a-half-year-old
Natália Kertész is sent to
boarding school [begins
Grade 11 at the private
United World College of the
Adriatic in the seaside
resort hamlet of Duino in
northeastern Italy]

August 2007
• 18-and-a-half-year-old
Natália Kertész moves to
Paris, France

September 2007
• Natália Kertész starts
university

29 January 2010 ( Fri. )
• Sherlock Holmes meets Dr.
John Watson

June 2010
• 21-and-a-half-year-old
Natália Kertész graduates
from the American
University of Paris
• Natália moves back to
Budapest, Hungary

13 June 2011 ( Mon. )
• Natália Kertész's father,
Nikolasz, dies

23 June 2012 ( Sat. )
• Sherlock Holmes leaps to
his apparent death from
the roof of St
Bartholomew's Hospital

24 December 2012
( Mon. )
• 24-year-old Natália Kertész
meets almost-33-year-old
Sherlock Holmes near the
beginning of some of his
deep undercover work
within Hungary, and they
end up having sex the first
night they meet

17 March 2013 ( Sun. )
• Natália and Sherlock spend
Sherlock's last night in
Hungary together,
unknowingly conceiving a
baby

9 August 2013 ( Fri. )
• Sherlock Holmes finds
himself back in Budapest,
Hungary after nearly five
months in order to tie up
a loose end from one of
the many facets of him
disassembling Moriarty's
"network"
• Sherlock shows up at
Natália Kertész's apartment
and back in her life, only
to find that she's almost
five months pregnant; he
learns from her that the
baby is his and that it's a
girl

August 2013
• Sherlock spends a few
weeks in Budapest, tying
up the loose end he came
for in the first place while
also coming to terms with
the fact that he's going to
be a father

2 September 2013
( Mon. )
• Sherlock departs from
Budapest, promising
Natália that he will return
in time for the birth of
their baby girl

5 September 2013
( Thurs. )
• Natália Kertész
"coincidentally" receives
her first visit from
Sherlock's older brother,
Mycroft Holmes, exactly
three days after Sherlock
departed

28 September 2013
( Sat. )
• Natália receives a visit
from Mycroft's PA, Not
Anthea, who's checking in
on Natália for Mycroft
[and Sherlock]

31 October 2013
( Thurs. )
• Natália receives another
visit from Mycroft,
checking in on her for
himself

24 November 2013
( Sun. )
• Natália receives another
visit from Mycroft's PA,
Not Anthea, who's
checking in on Natália
again for Mycroft [and
Sherlock]

10 December 2013
( Tues. )
• Sherlock Holmes arrives
back in Budapest, Hungary
in order to be with Natália
as she finishes out her
pregnancy

19 December 2013
( Thurs. )
• Natália Kertész gives birth
to a daughter at the
Medicover Maternity
Hospital in central
   Budapest; Sherlock is
with her through the
entire process
• Sherlock says "I love you"
   to Natália for the first time
• Natália & Sherlock decide
to name their daughter
Luna Vivien Nikoletta; the
little girl's two middle
names are in honour of
Natália's late parents
[a.k.a. Luna's maternal
grandparents]

20 January 2014 ( Mon. )
• Sherlock departs from
Natália and their baby
daughter to continue his
quest of disassembling
Moriarty's network,
promising to return when
he will be able to do so
discreetly

8 February 2014 ( Sat. )
• Mycroft Holmes pays a
visit to Budapest, Hungary
and meets his niece for
the first time; he also
gives Natália a large quilt
for baby Luna, a gift he
says is from his mother —
Violet Holmes — who he
says looks forward to the
day when she and her
husband can finally meet
their granddaughter and
unofficial daughter-in-law

14 February 2014 ( Fri. )
• Natália Kertész receives a
diamond heart necklace
by the Swiss luxury goods
   company Chopard from
   Sherlock in the mail, as
well as a cream-coloured
   baby elephant adorned
   with blue and yellow
   stitching by the German-
   based plush toy company
   Steiff for Luna

27 March 2014 ( Thurs. )
• Sherlock Holmes arrives
back in Budapest, Hungary
to visit Natália and baby
Luna

21 April 2014 ( Mon. )
• Sherlock once again leaves
Budapest to continue his
quest of disassembling
Moriarty's network

7 May 2014 ( Wed. )
• Natália receives another
visit from Mycroft's PA,
Not Anthea, who's
checking in on Natália
[and Luna] again for
the Holmes brothers

13 June 2014 ( Fri. )
• Sherlock Holmes pays
another visit to Budapest,
Hungary to see Natália and
baby Luna

30 June 2014 ( Mon. )
• Sherlock once again leaves
Budapest to continue his
quest of disassembling
Moriarty's network