Need advice: explaining to child, 9, they won’t be going to their father’s house for awhile.

Posted in r/Askparents but have not received advice yet. I’ve been given some legal advice and am in confident in that aspect. I am posting here to reach a greater audience. I am looking for different perspectives on how to approach the issue with the child. Any advice would be great! Thank you.Background info: I’ve been dating my SO for nearly a year. She has lived with me nearly that entire time. She and her daughter officially moved in full time with me 4 months ago. Every other weekend her mother drives hours away so that the daughter can spend time with her father, half sister, and 4 step brothers.I’ve never met this other family but I have extreme reservations about her spending time there. I don’t feel the children are properly being cared for or that it is an overall safe for place for any child.The daughter has told me her dad has a whooping stick. He has never struck her just the boys. The oldest boy, who is the most trouble apparently, has hidden the whooping stick on multiple occasions I’m told, and the father keeps making new ones.My SO has been physically abused by this man. She was pushed and had minor serious injuries. The half sisters mom of my SO’s daughter was also assaulted about years ago as well. My daughter was present when this mother was slapped across the face by this man.This man has never paid child support for either of his two daughters, one being my SO’’s, the other being the mother of the half sister. Yet, he is dating a woman with 4 children and struggling to make ends meet.My SO and I are struggling financially as well.So, my SO and I do not feel comfortable sending our daughter to visit with her biological-father. We feel as much of a deep loss it is to have this part of your life removed. It is in her best interest. She loves her father very much, but in our eyes, unless he is making an effort to support her financially in some respect, he’s not actually a father.Please be transparent, if I’m wrong or could be doing something better please advice/suggest. Thank you.SO has 100% custody. The parenting agreement states that the father is entitled to supervised visits at mothers convenience. via /r/Parenting https://ift.tt/2B4TIsA