Good question, I have two family members like this both women and neither have dated or have kids.
But it would be interesting if they did. I believe my family would be on top of the father of the kids ass way before the child is born to make sure he was going to be in the child's life. What's wild is one of my family members have friends who are also like her and they date, get drunk, and have kinda normal social lives. One of the dudes is even a dead beat alcoholic dad.