rhubarb, my dp's mom was like that when he was growing up after she had split from his dad, "your dad's crap", blah blah blah. He actually despises his mother for slagging off his dad when his dad never did vice versa, and has quite an intolerable relationship with his mom now.
She cant understand why, " I was the one that was always there for you etc"..
the most awful thing she could ever do was spill to dp when he was 15 that the man who he always thought was his father wasnt. No sitting down around the table discussing it, she actually told him in an argument when he said that he wanted to go and live with his dad.- "he is not you dad anyway" were her exact words.
Dp has an amazing relationship with his dad, he is an amazing man.
bit off course but the point i was trying to make is- some mothers can be downright spiteful, and it does them no good.