Not wanting baby around ppl

My fiancé aunt and her kids had Covid virus last month and not my fiancé wants to take my baby 5 months around them. I’m totally against it and have told him no multiple times. So today we got into another argument him trying tell me that they are over it and blah blah fuck that idc my baby don’t need be around that. So I told him he is more then welcome to go there hisself but to not come back into this house for the 10 day quarantine. His aunt has started txting me and saying all kind of nasty shit so now I said they can’t see her at all and he all pissed oh well if he can’t see that my daughter is more Important then his damn family then idk what to tell him.