Board Thread:General Discussion/@comment-5474309-20150831234533/@comment-31602355-20170326063145

I suppose I was the only one who assumed Shermie was a girl, wasn't I? "Shermie" sounds like a girl's name to me. In addition, I assumed Shermie was female because the baby had pink spots on its cheeks like Mabel instead of that pink splotch on the nose like Dipper and the Grunkles. My headcanon is all set to go in that Shermie is a girl and became a teen mother at the tender age of 14, and then her daughter did too in 1999. Ah, the curse, of single young motherhood. But that makes sense as to how the Pines' surname was passed down. I'm pretty sure Shermie would be dramatically kicked out of the house by her father, like Stanley was. Shermie never gets married and becomes a strong independent young mother after being taken advantage of by a sleazy boyfriend in the '80s, and her daughter doesn't marry the father of Mabel and Dipper until after he graduates from college and gets a job to fully support her and the twins. But alas, it is conjecture. I don't know if Shermie has an official character page, but I'll look for it and the official gender.

I feel like if the Grunkles had more siblings, we would have heard at least a bit about them, especially if they were older and could have been some sort of role models for the boys.