I hope your husband is able to get a raise. I was thinking I would be scared to ask for a raise like others have stated that it might make the company think he is unhappy and then he may not have the job security that you have now.
For me personally, I would rather have job security than get paid more. My last full time job I got a pretty significant raise after we got new owners, but then things were going downhill with the new owners and I ended up getting let go, so now looking back, I would much rather have the lower pay, but be happier and more secure in my job since now I don't have one.