If the husband can't control his compulsions, it's time for him to see a therapist about that. It's not "just an excuse" if it's a mental illness, but it's something that should be treated, not inflicted willy-nilly on the rest of the family.

Also, correcting someone's work in front of them is not in any way the same as teaching them the right way to do it, and he needs to stop insisting that it is. "I'm not doing this to soothe my agitation, I'm doing it for your own good" is a perilous trap for someone with OCD.