They are so sweet
Filou who was 16 weeks old when we got him ( so he couldn't miss his mommy too much ) and who was 3 weeks older (but much smaller) than Tigris used to suckle with Tigris during his first year
They both got over it when they grew up ....
I think as long as Finnegan is ok with it (and he seems to say no when he's had enough) they should be fine.