I with icanhandthemback. I think it is an example of passive aggression or a man trying to control you by killing you with kindness. He knows what is best for you and in the kindest way he is going to insist that you do it.
The nice helpful persona is a way of making it difficult for you to object to what he is doing 'But Mum, I am only trying to help you'.
It is difficult to deal with people playing this little game, but you have to tell him firmly and in no uncertain terms that next time you catch him doing any of the things he knows full well you do not want done you will sanction him in some way, ban him from the house for a month, if you think that would work. Still see him, but just not at home. You know him best, so best know what the right sanction would be.
Someone like this is as controlling and bullying as any overtly aggressive man, who ends up in court. Just a bit more clever and hiding his aggression behind a smiling face. Hhe must be faced up to and made to stop this controlling behaviour before it escalates.
And whatever you do , do not have his name on any power of attorney.