Sorry I didn't read this sooner! Been stuck in my own little world.
((((((((8888an8888))))))))
Parental responsibility could have so many meaning. It could be the husband's kid. It could even be pets!
Why do you think she would care about you any less if she does have children? People can love more than one thing/person at a time.
I have had a TON of mother-figures (i.e. maternal transference) over the years. I have actually foumd that the women who already were mothers were more motherly.
Do talk to your T, please. Just simply ask her if she's married and has children. Then see where the conversation takes you.
Btw, I was shocked as hell when I found out my Pdoc was pregnant. I didn't think she was married or had kids, and for the reason I thought she might be gay. Wrong on all accounts
Please stay safe.