Would you be supportive of your husband meeting his biological father?

My husband didn't really know his biological father. He was 3 when he left and his mom claimed he abused her and sexually assaulted her. His mom was very abusive towards him and he was forced into mental health hospitals because his mom would make up lies about him trying to harm himself or harm her to throw him into mental hospitals. When CPS took him and his half sister away she told CPS he sexually abused his sister which wasn't true and his sister has said it wasn't true. She just said that so he couldn't go with family since they all had kids and he had to be in a home by himself since she said that. So he had to go into CPS custody. He has been wanting to meet his dad just to hear his dad's side of the story and know him. His dad eventually found him and wants to meet him. I'm just worried because we have a daughter and this is an alleged abuser. It's possible his mom is a complete liar. It's also possible his mom is both a victim and abuser. I understand my husband just wanting to hear his dad's side and maybe have a good parent. I want to be supportive but as someone who WAS SA'd as a child protecting my daughter is my top priority.