I had a Maine Coon many years ago and your Zeus looks to be very slender built although he has a good weight,maybe he's bigger than he looks.
My MC had really heavy legs and paws and of course the ear-tufts.
I believe the NFC,is very similar to the MC.
Zeus is probably a mix,who kknows with what,but I think he's gorgeous,as is the pup and the other kitty,nice fur-crew