Once after helping me move into a new apartment following a divorce, before leaving, my mother looked me right in the eye and asked, "Can you survive?"
No, mother, you'd better stay with me. I'm a helpless child, and I'll curl up and die if you cut the umbilical cord.
That was 10 years ago, and if I hadn't moved almost 3,000 miles away from my mother, she would still be trying to rearrange my house, reorganize my cabinets, and such. For that matter, she still wants to hold my hand when we're crossing the street.
And I'll be 47 years old in June.
Sorry, but I don't think there is any "polite" way to handle this. You're going to have to put your foot down, even if they call you an ungrateful child, or get all teary with the "I'm only trying to help" routine. Either they knock it off and let you live your life your way, or you move so far away from them that they can't do this to you.
_________________
Your Aspie score: 135 of 200
Your neurotypical (non-autistic) score: 83 of 200
You are very likely an Aspie
AQ score 35