Forum:Finn's Biological mother might be Marceline's mother

It's a Theory I thought of. If you look at the photo of Finn's mom next to Martin, and compare it to the one of Marceline's mom in the family photo, they look similar. That would make her his haalf-sister. Maybe the women are sisters, or the same person or related in some way, but I feel like this needed to be shared. Any thoughts on this? http://images4.wikia.nocookie.net/__cb20091227230730/adventuretimewithfinnandjake/images/archive/b/bc/20100401212842!Wiki.png