The husband feels uncomfortable when chatting to one of the (removed) of his wife.

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My advise will then be to seek the intervention of a scholar, or elderly person or any person you think the husband respect. He needs someone to sit and speak to him and advise him on the need to have relationship with his in-laws. He should understand there is life and death and anything can happen. It will always be healthy when one has positive relationship with his in-laws