Board Thread:General Discussion/@comment-25246269-20140802202734/@comment-24941027-20140807094249

Diggledog wrote: The "basic gist" is that in the episode with Mermando, there was a bottle that Mermando sent to Mabel. Inside the bottle, there was a paper with 'LEBAM' written on it instead of 'MABEL'. So, now some people (including our wiki's users The Sqoou and Vailskibum94) think that Lebam is a clone of Mabel or a Twin of Mabel. Making Dipper, Mabel, and Lebam triplets.

Why not? In Gravity Falls all is possible.