Over the years, I have found that many women who had a bad relationship with their mother found it difficult to make an easy relationship with in- laws family and, especially, mil. Be nice Count Fosco, enjoy your son and GC and be pleasant and welcoming to your Dil. Families are complicated things. Don't push her to be what you want but accept who she is. Your son loves her (I assume) and you love him and GC who you obviously want to continue seeing. The relationship works, in that you do see them and she comes to stay with you. It may not be the relationship you wanted but it is a relationship you have. Life is never perfect. Make the best of what you have.
I hope all goes well.
HMRC slightly angry is an understatement


