Son being mentally abused by wife???

Hi all, not on here often.just would like some advice please. Our son has been married almost a year and has a 7 month old son. His wife seems super on the face of it and both myself and my husband help them out out in many ways ..... We are only too delighted to do so. I am constantly helping and advising my Dil literally daily, morning to night as she calls and texts for all sorts of reasons, and I never let her down or turn her away. They are are young couple btw. We found out today that our son is desperately unhappy and is suffering daily , what almost amounts to verbal abuse it seems to us. Continual bossing as soon as he comes in from work,( he is in the armed forces), name calling, the rudest of the swear words at times, and he is at the end of his teather. He doesn't want to divorce for the sake of his child but doesn't know what else to do..... Advice please!! Do we just carry on with a front of normality for now?