How can I help my husband when his parents are going through a divorce they been together for 27…

If it were me I'd just try my best to be of emotional support. Tell him how much you love him , talk to him ( pray with him if you believe in God ) sexual favors lol be understanding, maybe make a special meal or distract him with things he likes to take his mind off of things a bit. My advice.

Just be there... It's hard, but just be present. He'll open up in time as needed.

Maybe some books