Okay guys, before you read this book, I'm sure most of you reading this story maybe confused who is related to who. So I made this chart. Thanks again for reading!

Cipher/Strange Family:
First we'll start with Tad and Bill.

Tad and Bill are only half brothers, they share the same Father.

Illumi and Kryptos are related to Bill because they are cousins. Illumi being a relative from the father's side and Kryptos from mother's side.

Now for the two main Families:
We have the Strange Family-

Tad Strange is married to another demon named Tsuki Lepos. Thus making a baby from the their love, the proof? Read the first book, you obliviously missed something.

Stella Lepos Strange, the daughter of Tad and Stella Strange. She is the original from her dimension and her lover is none other than her reverse self, Mabel Gleeful. Both of them are still dating.

Finally the Cipher/Gleeful Family:

Bill Cipher fell deeply in love for his reverse self, Will Cipher. The two of them got married and had a baby, but due to complications the baby wasn't born in the most natural way or happy situation. Again if you haven't read the first book, go back right now.

Their child is none other than the original Dipper Pines, but he is now know as Dominic D. Cipher. He was reunited with his Father after 12 years of separations (curtesy of Ford). Then knew who his Mother was a few years later. He's currently dating (those who read this book already now their current status, no spoils) his reverse self, Tyrone (Dipper) Gleeful.

Dominic and Tyrone both have two kids. Blake and Akira C. Gleeful, who are the bundles of joys that are being taken care of by their parents and grandparents.