HolyHannah
Starblaze -- My MiL did try to interfere with the "grandparents" but thankfully Our OM (Other Mother) knew how to handle the situation. She was 100% on Our 'side' and protected Us and her grand-children from the insanity. I'm given to understand my MiL was displeased at being shut down.
The jealousy of someone else calling Our children 'their grand-children' definitely lead to a renewed hostility.
This I'm somewhat familiar with- I say somewhat because circumstances and dynamics were different and handled differently-
It happened years ago when my husband was alive- He was like did you notice, and before he finished his sentence I said uh huh-
Both parties saw something shiny, it took about a year for the shine to wear away and another to be gone-
We just sat back and observed, neither supportive or against, no wagers, no monkeys- The OGM would tell us the kids called her GM, and we'd be like oh, yeah? And listen to her talk- Her husband didn't play, he just chatted up about other stuff- Despite the game we witnessed being played, we liked them anyway-
In the end, it simply reinforced the existence of patterns-
And that was kind of that-