Fig: The children in this case are from her son's one night stands. Of course it is not the kids' fault. Maggot's son disowned her when she left - he stayed with his dad. Like my kids, he was blown away but his mother's cavalier attitude and abandonment. Now that he is older - he takes advantage of her desire to resume their relationship and when he gets visitation (which he does not appear capable of handling) - he hands them to her.
I'm with my kids on this one. He's there dad. He was in their lives for most of their kid years. To suddenly be "grandpa" to someone else's kids when they have no kids of their own - is unfathomable. But, whatever - I think maggot just likes "playing house" with him as they never had kids of their own.
It is what it is. It is not something I really think about much.