Board Thread:General Discussion/@comment-25301131-20150302004409/@comment-26072045-20150423010132

Ruby gleam wrote: Twins dont run in the family I think that that twins in the show are used as a clever plot device Actually there is such thing as a tendency for twins to run in the family but this mainly applies with fraternal twins. It's very unlikely to have a gene that makes it morel likely to have identical twins. Anyway since Dipper and Mabel are fraternal and Stan and his brother are identical they were conceived in different ways. Therefore it wouldn't "run in the family" because it'ss two completely different types of twins. It's just coincidence in this case.