How can I help my husband cope with his mom wanting to remarry?

My husbands dad passed away 4 years ago at the young age of 55. His mom took it really hard and was in a deep depression for over a year. A Little over a year ago she met a man who is wonderful for her. He has a lot of the great quality's that my husbands dad had. He has made her very happy. Last weekend at a... show more My husbands dad passed away 4 years ago at the young age of 55. His mom took it really hard and was in a deep depression for over a year. A Little over a year ago she met a man who is wonderful for her. He has a lot of the great quality's that my husbands dad had. He has made her very happy. Last weekend at a family get together they announced that they were engaged and getting married on valentines day. My husband hit the roof, he thinks that she is moving to fast and trying to replace his father. He has gotten a long really well with this guy up until last weekend, they have spent quite a bit of time together and he has always been fine with him. Now he says he does not want him in our house, and if his mother marries him he will have nothing to do with her either. He does not even want either of them around our children. I could see this as being normal if he was a kid or even a teen, but he is 30 years old. How can I change his mind or at least make him understand that his mom needs to do what makes her happy? usually my husband is very logical but he is way overboard with this.
Thank you for any help you may have!
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