Since they're partly based on kangaroos, and their front legs are too short to reach the ground from a proper sitting position, me and Mint both kind of thought it would be more like how a kangaroo sits. Like more on their legs than their bottom, and without having their front legs down (again because they are too short) when I get home from work I'll try to get a couple of sketches up.
So pretty much sort of like how a dog sits, but their back arched to keep their balance since they couldn't use their front legs to do that?
*EDIT*
SO I was messing around, looking to some kangaroo references, and I came up with this derpy sitting thing, because if they were trying to sit with their front legs down it would probably look something like this lol
