Visitation rights with my kids...?

Yea she can say what she wants,but legally she can not stop you from letting your daughter see or be with your G/F and her daughter as long as there is no harm done to the child ..It's none of her business while she is in my care.

She has a right in your kids life whether you like it or not. Sounds like there is a lot of drama and it needs to be all discussed for the sake of the kids. maybe all three of you should talk no matter how uncomfy the situation is. If you guys are newly divorced it does take time to adjust. keep that in mind. If the other way around you would probably be the same way.

Absolutely not.

Your ex-wife has no right to tell you who you and your children can/cannot be around while they are in YOUR care. You're their father - you get to decide if it's safe to bring a person around your kids.

unless your parental rights have been taken away and she can prove that the girlfriend is unfit then she has no say in what goes on when the kids are with you. If your parental rights are intact, then it is believed that you, as the parent, are fully capable of making the decision as to who is appropriate to bring your children around.

She has no case. Do you have court ordered visitation? If not, file for it now.

just do what you feel is best for your kids and don't care about what your ex thinks..