Stray cats

I live with my partner. Six stray cats live behind my partner’s house. We feed them every day; we’re trying to get them to trust us and come indoors in the winter. But, they do not trust us yet. There are two orange cats, a black cat, a dark gray cat, and an older light gray cat.
The light gray cat is the mother of the others. She appears to be still very wary of my partner and I. My partner has been feeding the other cats since they were kittens. This is the reason why they seem more trusting of us.
We tell the two orange cats apart by their weight. Orangy 1 is larger than Orangy 2, but Orangy 2 seems to trust us more than Orangy 1. We don’t know the sexes of any of the cats except the mother. My partner knows this is the mother cat because she was around first.
We can’t get close enough to the other cats to determine their sex. My partner refers to all of them except the mother using the pronoun “he.” I refer to all the cats with the pronoun “she.”