I live with my partner and my two sons from a previous relationship and his daughters from a previous relationship stay with us every weekend. And as the title suggests, I'm finding myself at breaking point. I love his girls dearly and I hate myself for admitting this out loud but I've grown to resent them recently. They're 8 and 12 and I can't stand how they treat my boys and boss them around. They're often spiteful and nasty to them, as kids are but the fierce mother bear in me can't stand it. I'd love to have that fierce kind of love for them that I do my own children which would perhaps make me look past a lot of the things they do but it just isn't there :( I also can't stand how they speak to me, especially the eldest, which is where a lot of the resentment has come from. I've spoken to their dad about it and he's talked to them about it and nothings changed. Granted, the oldest is 12 so I know she's at the age where hormones are flying all over so I try and be a little more lenient in view of that. The 8 year old however is very spoilt and so used to getting her own way with everything. She's really difficult. She tries to control everything my boys do. She tells them off. And what irks me more than anything is they both try and tell me how to parent, which is ridiculous. I've spoken to their dad about it who says they're just kids and it's just who they are but I can't help but find it so incredibly rude and disrespectful. They just don't respect my boundaries at all. For example, this morning, my son was at the table and his spilt his juice over the table. Accidents happen, no bother. However the 12 year old said 'are you not even gonna tell him off for that'. Explained why I didn't but I'm tired of having to justify my actions and my parenting choices TO CHILDREN. That's just an example, but it's so much worse than that. I'll be honest, I'm contemplating leaving. I'm sick of being undermined in my own house and feeling disrespected by everybody. I don't want my boys to grow up to disrespect me either. Any advice?