Your husband is under no obligation to cooperate until ordered to do so by a court. If the mother names your husband as the father your husband may voluntarily submit to a paternity test to disprove paternity. Just becasue the ex-husband wants a paternity test does not mean you should jump to the conclusion the child is not his. If the court finds your husband is the father it could order child support and your husband could be awarded visitation. This is an unfortunate situation because no one is a winner and the 8 year old is the big loser. His father is effectively divorcing him and his mother.

If the divorce is over, it may be too late for the ex-husband to challenge paternity.

In the case of Parker v. Parker, a Florida appeals court held that a man can, against his will, be deemed a father and obliged to support a child born to his wife during their marriage, despite the fact that the two have no biological or adoptive relationship. This is true where the man does not question paternity until after the divorce is complete.

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Please be aware that my answer is not legal advice, it is merely information and no attorney client relationship has been formed. You should always contact a local attorney for legal advice.