Wow, I must be lucky. My job considers an in-law to be immediate family, on the same level as a grandparent. We get up to 5 days paid bereavement to grieve/attend services. Personally, my brothers-in-law are like brothers to me. If one of them were to pass it would be like my own brother passing away.
I'm sure at the end of the day he'd be allowed to miss the game to be there for his wife and attend the service, if that was his choice.