It can be done depending on the dynamics of the relationship. You really have to be able to define the personal from the business (both parties have to be able to do this). I have a friend that owns a cleaning service in Maryland, and she and her hubby work together really well. In fact, he goes out with the cleaners to clean, while she stays in the office.
When I first started my business, my husband was laid off so helped out a lot. It was great (but I was the only one who thought it was). He didn't like answering to me. I don't know why he felt that he was because the business is in both our names. Then when I would ask him to do something he started saying stuff like, "Okay, Boss." So I know then he wasn't loving it. LOL!
My dream was that he would do all the commerical accounts and I would take on the residentials. I mean we were making a good income back then with the cleaning so I really thought that he would want to continue. He could not wait until he found another job. Go figure. It's still my dream that we do this together, but it's far from his. LOL!