I had a gastric bypass 7 years ago on the NHS. My weight was probably at the lowest end of the morbidly obese spectrum and I only just qualified. My parents were so worried about it (rightly so) as it is a huge operation that will impact the rest of your life. However think of what life will be like without it - I would have just got bigger and bigger, lost what little was remaining of my self esteem and would have been a massive burden on my husband, family and the NHS.
It was and still is (even on the bad days) the best thing I have ever done. Recovery is tough and the mental/emotional side is overwhelming at times but all the positive bits outweigh that.
But bear in mind it is not the miracle answer, all wls patients struggle for the rest of their lives with weight and food.
Go with him to the appointments and hear what the surgeon has to say, read and research and also watch some of the informative documentaries (fat dr was brilliant for me as it was set in the hospital I went to and with my consultant!!). If you are anywhere near the south, I can highly recommend St Richards in Chichester.
Again THIS IS NOT AN EASY OPTION, this is not a diet - this is for when you have tried everything (drugs, slimming world, weight watchers, Cambridge, lighter life etc etc) and there are no other option. It DOES NOT make him a failure, but pretty awesome to face up to it and do something about it.
there is an excellent Facebook group called wlsinfo which is UK based and there is a website of a similar name. do your research and keep an open mind, certainly challenge him, but don't make the decision for him because no doubt he is doing this for you and the family as well as himself xx