I don't think it is appropriate to take care of ex's children on a regular basis (if that's what you think she plans on doing).

As on and off keep in touch and so on it is ok. I am friends with my ex bf's adult daughter and see her and a her two babies. Well I am also friends with ex. But if he had children with a new women babysitting them would be weird.

I am friends with ExHusband as well and like his kids a lot as well as his new wife , but his kids are our daughter's younger siblings, which is not the same as some random kids, and I am not regularly babysitting them.

Bottom line if she has no kids with this man it is a bit weird to babysit his children. I understand being friendly as I am too but this is a bit much

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