So I have a 5 month old daughter, my first child, but her dad already has 3 other kids, me and her dad are together, but I have never met his other kids because of the mother she won't allow it! So that means my daughter has not met her siblings and vice versa. I really want them to meet but the mother just won't allow it, which in my eyes is so wrong, and obviously this is causing big arguments with me and my partner. What can I do? Is there any legal route I can go down or anything? Or is that not possible because obviously those kids are nothing to do with me. I just want this sorted and I want my daughter to know her siblings. PLEASE HELP!