I respect your opinion, but I also disagree. In other situations, perhaps, but in this case the mother was not at fault regarding the divorce, and has been there faithfully to love and raise their two sons. For Sassy to alienate herself from the loving mother, she'd also be hurting her two grandsons. I fully agree with what she is doing, if her son is smart, he'll have a change of heart someday and be a son to Sassy and a Dad to his sons.I'm sure many will disagree with me on this, but while the OP wasn't specific in what she meant by 'friendly,' and even though it sounds like the divorce was her son's fault, I don't believe parents should keep their kids' exes in their lives other than what's necessary for the sake of the children.