I've been with my husband almost 11 years, married for 5 of those years. He had a 3 month old daughter when we met, and I've raised her every since. We have a 6 year old together..... The ex only sees her child when it's convenient for her. She's awful.
When we first told my MIL that I was pregnant, she called my husband's ex and said "Don't worry, I'll make sure this new baby doesn't take any attention away from your child." Yep! Not even kidding. And to this day, my MIL always talks to my husbands ex and tells everyone that the exs children (the 2 that aren't his) are her grandchildren.
And when my son was born, she TRIED to take control and tell me how to be a mom... At family functions she would try and take my baby from my arms without asking. And she always had to be the center of attention when it came to my children. She even tried taking the spot light at my wedding!
I have a million stories to tell... but those are the ones that stuck out to me the most.