I've pre-teen step kids who are a little over-due for basic sex education, and certainly they'll need more comprehensive sex education in the home within the next few years. However their mother is of the belief that teaching children/teens about sex results in teen pregnancy, and their step-dad is a born-again-Christian who believes in abstinence-only education and teaching girls they're dirty if they have sex. sigh
Anyway...
I've talked to my partner about this, he's 100% okay with my answering any of the kids questions and discussing sex if it comes up, also as I work in sexual health so I have a lot of books and he's okay with the kids having access to these in our home. He's also fine with my helping the daughters if they need to use tampons, birth control, or even if they need an abortion - their mother would be 100% against all of this.
The problem is that the mother is a nut-job. When they were together she abused my partner to the point where she put him in hospital on multiple occasions, even today she is verbally and physically abusive towards him and far from nice to me. She's manipulative to the point where she will hurt her children emotionally to get to us, she'll come out with the most outrageous lies to get money from my partner, and she is constantly screaming and threatening to deny access to kids to get her own way.
Because of her behaviour my partner has to walk on eggshells and gives-in to her demands a lot, he really has no choice in the matter, but on this he plans on putting his foot down. The kids know not to lie to their mother but they are ridiculously smart kids so know not to tell her about this either...but what if she finds out anyway?
I'm sort of uncomfortable going against her wishes given as I am not the kids mother or even really considered a parent at all. I'm also terrified of the sort of trouble she could cause us.
Am I wrong for teaching her kids? If dad is okay with it then that's okay, right? They need to know this stuff and not giving them this information or support could put them at serious risk...I think I'm doing the right thing, but I'm just so worried about what she might do!