Divorce Support Forums: scared bm will hurt my kids

my husband and i have been together for 8 yrs. he has three kids from a previous marriage. we have two together now. bm cheated on my husband leaving him for one of his employees. she left and rarely saw the children for over a year. my husband let her have 50/50 custody because he wanted to give her a chance to be a mom again for his kids' sakes. their divorce was final two years after she cheated. she is now married to her affair and they have a child together. i came onto the scene right when their divorce was final.
my issue is this: i am scared that she is going to hurt my bio children with my husband because if she is at the same event as we are, she looks at my kids with hatred and disgust. she crinkles her nose and stares at them. she has also done physical things that i beleive are borderline assault. i.e. she bought a puppy and brought it to one of the kids' games. she was holding it standing up and my then 16mos old wanted to pet the puppy. she walked up to bm and reached up to pet the puppy putting her hand on her leg to reach. bm looked down at her and "bumped" her off her leg and hiked the puppy up higher so my daughter couldnt reach the puppy. when this happened it made my daughter fall on her behind. another time she happened to park kitty korner from me at an event. the space directly in front of her car was empty. i was buckling the baby in and my 2 yr old was staning by me partially in the empty lot. bm started up her vehicle, revved the engine, turned her brights on and started to pull forward which scared my child half to death. she tells her bio kids that my children with my husband "arent really your sisters." I am scared that she could hurt them..my husband thinks she is just jealous and not to worry. over the last 8 yrs we have had two restraining orders against her and her behavior is insane on an almost daily basis. she says one thing and does the opposite. her reality is opposite of what is REALLY going on. what do you think?

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