What should I do about my future in laws when they don't care about me beyond my willingness/ability to give them grandkids?

Anonymous
What should I do about my future in laws when they dont care about me beyond my willingness/ability to give them grandkids?
Firstly, I'm in a fantastic relationship with a significant age gap where I'm the older woman (I'm 40 and he's 25). I know many may be disapproving of that, but it's worked super well for us. He's much more mature, supportive, and better at listening then my ex was (who is older than me). We've been engaged for 3 months and dated for about a year before that.
However, when his parents first found out they strongly disapproved. They actually pushed hard for us to break up. When that didn't work they were passively rude and cold to me. However, with the recent news that I've gotten pregnant with twins they've become drastically more warm towards me/supportive of our relationship. That tells me the biggest (if not the sole) reason why they were so cold and hostile was because they assumed I was either unable or uninterested in becoming pregnant (neither of which were at all true), which would mean they wouldn't get any grandkids from my fiancé.
On one hand I feel like this new warmth/ support should feel like a completely good thing. I've wanted it for a very long time. However, their sudden change of attitude (completely due to my pregnancy) has in a way put an even worse taste in my mouth. It tells me the only thing about me they care about is making grandkids for them. I do want to have his kids (plural if possible), but the fact that's the only thing they care about in regards to me makes me feel like they don't really care about me, just what I can give them. Normally that's the sign of someone I wouldn't want a relationship with (or at least a minimum relationship with). However, given that they're my fiancé's parents (and my future children's' grandparents) it's obviously more complicated then that. There's also a part of me that would still like a good relationship with them. How should I approach my relationship with my in laws given that they don't care about me beyond my willingness and ability to give them grandkids?
What should I do about my future in laws when they don't care about me beyond my willingness/ability to give them grandkids?
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