Weird family dynamic

Quick backstory:

Im a single mom to a 2.5year old boy. His dad has made these past 2 years hell for me and I recently cut contact for my own sanity and because he wasn't helping anyway.

I live alone with my son and ive been wanting to date for a long time. I dont go out with friends all i do is WORK and go home.

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So I met this guy that I actually like and we've already been on 2 dates but that was a couple of months ago when my sons dad would keep our son a few hrs at a time. Now he doesn't see him at all.

This guy and I had plans for this weekend but I've had to cancel and reschedule because not even family will keep my child and I just find it odd. I dont have a huge family but my mom and sister who I talk to nearly everyday both make excuses when I ask them to watch him. I even offer to pay. They've never watched my son before and he's almost 3. Im fully aware that family isn't obligated to babysit but being that we are so close and they know my situation as a single mom and that I never get a break . You'd think they'd be willing?? Or am I being selfish?

I just find it weird this is my mom and sister we are talking about. They won't watch their grandson or nephew even with pay? Shit is weird to me and it makes me want to distance myself from them

Anyone in my situation? What was your solution?