ANSWER: Of course all the prayers are invalid and he has committed a major sin if he knew ghusl was mandatory but he chose not to make it! He cannot make up those prayers!

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ANSWER: Of course he is sinful! He must have stepped back and not allow her to touch him, let alone hug as Prophet ﷺ said its better to be stabbed in the head by an iron needle than to touch a non mahram 

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