@sullyfish6,
Are you saying that your ex-wife is now having a relationship with a man and you are concerned about how the kids are dealing with that?
It is a legitimate concern, especially if this person is spending the night at the house when the kids are there.
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Sorry but the courts does not view another sexual partner being around children as a cause of concern unless there is something in that partner background that would indicate he or she should not be around children.
Otherwise the man in a divorce could stop the ex-wife from moving on with her life or the man could not have the children over to his home with his new girl friend either.
See any divorce lawyer for more details.