I wish I would've have seen your thread earlier. Here's an old b&w silent film from 1944 about a couple of cats rearing kittens.
http://www.moviesfoundonline.com/pri...e_of_a_cat.php
"A male cat courts a female cat and they raise a family together. We see the kittens being born and nurtured by mother, while an interested and proud dad lends his support. Beautifully photographed and executed. With subtitles, no dialog, and a refreshing absence of human beings onscreen. Very touchingly realized by Alexander Hammid, whose collaborations with Maya Deren I had prior acquaintance with, and also highly recommend." -imdb.com