Sexual Abuse Support Group
Sexual abuse is a relative cultural term used to describe sexual relations and behavior between two or more parties which are considered criminally and/or morally offensive. Different types of sexual abuse involve: Non-consensual, forced physical sexual behavior such as rape, incest or sexual assault, or psychological forms of abuse, such as verbal sexual behavior or...
I am sure he is denying everything and his argument probably sounds very good and believable. I am glad you believe your daughter instead of him though. So many children, even adult children, are not believed. I am also glad you are spending so much time with your daughter. If she isn't working with a therapist please try to get her to go to one. She can heal from what has happened and she deserves to heal. You also deserve to heal.
I believe you have already found the board for parents of children who have been sexually abused but if not here is the link https://www.dailystrength.org/group/parents-whose-children-have-been-sexually-abused
I really am so sorry for what is happening to your family. ((Hugs))
Thinking about you both xx