[QUOTE=olivesmarch4th]
No, not his sister, his mother.
My mother-in-law.
We are the kids she will not leave out of it.
[/QUOTE]
She is a toxic parent.
Boundaries are needed and it will take a while for her to understand that her son has erected walls.
When she calls. Do not answer the phone. Let her leave a message or voicemail. Then, if needed, call back after a self imposed 24-48 time period. Let her know she is not of vital importance and that she has been downgraded from MOM to PITA.
She can do these things because her children give her permission to do them.