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Yes, this should be justification for filing a motion to modify visitation to require the father not to have overnight female guests when your child is staying there. Even without the criminal histories of these people, most judges don't want the new girlfriend staying overnight when the child is there -- it's just very awkward and uncomfortable for the child, and judges don't want to place a child in a stressful situation.
So, this certainly should be a legitimate basis to ask the judge for a modification......at least to prohibit overnight guests of the opposite sex UNLESS he remarries and the person is his new spouse.