How to talk to husband about FIL?

knottiec7adfd8248673cac

I have a 10wo and I go black to work tomorrow. My FIL is coming to visit soon for 5 days. My husband and FIL will be home alone with the baby for 3 days. I have always felt a little leary of my FIL. He has boundary issues that give me pause. I do not want him left alone with my daughter. My husband likes take naps in the afternoon. I am concerned he will ask FIL to stay up with her alone for a few hours. How can I talk to my husband about this without making him defensive? I don't have any concrete reasoning for this. It is just an intuition. Help me find the words.