I would be absolutely fucking incensed if my boss did this. This is stepping over the line MASSIVELY. Just how DARE he do this? 
I would definitely be talking to your boss about this @ajdjad and would tell him never to contact my husband again. I would probably even put my complaint to him in writing, and tell him you will escalate it to HR if it happens again.
He doesn't 'care' about you. Bosses/supervisors/managers very rarely CARE about their employees. You do get the odd few who do genuinely care, but most of them do not... He is just being nosey and intrusive because he is pissed off and salty about you not doing overtime. At this point I would be looking for another job to be honest.
I speak as someone who has a DH who used to work at a particular place (Monday to Friday (9am til 5.30pm.) Some weekends they would ring up our landline at 7.30am on a Saturday to ask him to come in for a shift 9am to 3pm. When he said 'no as we have plans' they would accuse him of not being a team player and not being loyal to his employer.
ONE time, he said 'my wife is going out with the kids and a friend, to the beach - and is using the car so I can't get there.' (Workplace was off the beaten track with no public transport, and 9 miles away.) The supervisor said 'let her get the bus or walk. Is she idle or something?'
Horrible, rude, entitled, and intrusive behaviour.
His supervisor rang once on a SUNDAY morning and said 'is Steve there?' I said Yes he is, he is in bed and he is NOT coming into work.' Then I hung up.
On Monday he was hauled into the office and told off - because 'Anne' was so upset at how 'nasty' his wife was. DH told them what she has said about how me and our kids must be lazy for using the car to go to the beach. It was 70 minutes drive, but 4 hours by public transport and very few trains. Last one back to where we lived at 3.30pm (at the time.)
tl;dr, he was so pissed off by then that he started looking for another job and left a few months later.
Oh also, a woman who used to work at a place I used to work at lost her parents just a few weeks apart. A few days after her mum's funeral, her dad died. Long story short, it really knocked her about and she went on the sick for 4 weeks with stress and depression. A few days before the sick note was up, she handed another one in for a further 6 weeks The manager kept ringing and emailing her, and when he got no response, he started contacting her husband and her sister. (On facebook!) 'Oh is Linda OK, by the way when does she plan on coming back?'
All he cared about was when she was returning, as he was pissed off that the company were paying for her to be at home. Never mind that she was wrecked with loss, grief, and depression, after her parents died so close together, and she was only 34, with a 6 year old son. She was struggling to keep it together, and all her boss cared about was when she was returning to work. She had been there 12 years with less than 10 days off sick the whole time - and she returned to work after her son was born, after 4 months!
Most bosses don't give a shit about the welfare of their employees. If you have one that does, you are in the minority, and are very lucky!
Some employers/managers/supervisors are utter arseholes, and don't like ANYONE who is not obsessed with their job, and actually has the audacity to have a life outside work.