MissAdventure
I don't have a specific time frame, but as I've said, someone I've known for a few months wouldnt even be on my radar as a potential childminder.
My ex who I met when my daughter was three, well, he desperately wanted to take her for see father christmas.
By the time I agreed, she didn't believe in him any more. (Father christmas, not the ex!)
To be fair, they’ve been dating for a few months, but no mention of how long they’ve actually known each other.
They may have been friends, or a friend of friends, a work mate or online dating!
As for speaking with her son re her concerns, I’m making a (huge) assumption that OP is getting all of her, or much, of her “facts” from her son, so she really should know already how he feels about everything.