I know all of Kyra's siblings (since they're Mini's pups) and get regular updates on most of them.

Micki and Mini are siblings. I do know that there were four total puppies in their litter though, and last time we talked to the 'breeder' he told us that Micki and Mini are the only two left. One was hit by a car and I'm not sure how the other one died.

I don't know any of Shadow's siblings but I did know her parents, her dad has since passed on.

The cats Motchka and Batman are siblings too, I took them and their brothers in when they were babies. I found homes for the boys, but eventually lost contact with the new owners.