Thanks for the responses, it's really helping me to think!
Just to clarify - this is NOT a child free wedding. My sisters children will becoming and various friends children will also be in attendance.
If DF's son was your average 12 year old then it wouldn't be an issue, ofcourse he would be there and involved.
Re: the title of post...sorry it does look harsh was just trying to convey dilemma succinctly.
We cannot 'hire' someone to help - son is very very wary of strange people and it would have to be someone he knows very very well to even get him into the building.
I have known DF for 10 years and we have taken things very slowly. For a long time I was not present when his son visited as it was too anxious for him and interupted time with his Dad. Gradually I interacted more with son and he now accepts me most of the time although will sometimes push me out ofthe room (or less often out of the house lol!).
When planning the wedding our first thoughts were of how to work it around his son and DF decided that it would be less stressful for son, myself and our guests if son was not there. DF made the decision as he wanted to be able to relax on his wedding day rather than be on alert for potential problems with his son. He does take alot of care and will probably never live by himself (although we can hope!!).
It was only when MIL told his ex that this was the plan and his ex has gone mad at DF saying he's ashamed of his son and being excluded from our family, and he was a pathetic dad to not want his son at wedding, he's being selfish by not wanting to care for him at wedding etc etc. DF is heartbroken at accusations and is now wondering about including him. I am upset because we have planned a wedding that is justnot really suitable for himto attend. It is at a stately home, civil service, hired a string quartet, champagne reception, and wedding breakfast followed by more music, fireworks and dancing. We have 150 guests and 200 in evening. It is a big occasion!!!
I am pretty sure son will have a meltdown which generally involves slapping people and shouting, possibly pulling someones hair and then he sometimes drops to the floor where you have the choice of dragging him out while he is lashing out or leaving him on the floor. My concerns are really that son is goingto get into this state, DF will have to confront it and it can be upsetting for people to watch.