My husbands ex says he is her sons dad granted she was married and living with her husband while with my husband, well I dont think he is the babys father and when we say we want a paternity test done all of a sudden he isnt the dad so only when she needs money or diapers for him thats when my husband once again is this kids dad, we argue about this all the time im afraid this will drive a wedge between us...what should I do any advice

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