My ex-daughter-in-law is so jealous that the children still want

Villas - My ex-daughter-in-law is so jealous that the children still want to have a relationship with me that she blocked my phone number and told the kids that I died. I was wondering why my grandchildren never call me anymore or acknowledge getting their gifts that I send to them. I've always had a great relationship with the kids. I feel so bad for the kids thinking about how upset they are. She's even jealous when the kids have friends so she grounds them so they can't have friends. I think she would stop them from going to school too if she could.