As has already been mentioned, much of the info is age dependent.
But here are a few general rules of thumb from the perspective of an Elem. Teacher/children’s entertainer who has dealt with many different children and parents.
From the earliest age on (even toddlers) respect and validate whatever your child’s feelings are regarding their own body and personal space.
If this means finding an alternate form of greeting for Aunt Kissyface who insists upon smothering the kid with slobbery kisses and crushing hugs in spite of the kids squirming and obvious awkward body language then so be it.
Not every kid automatically likes this level of intimacy from someone they only see twice a year at most.
Even tho she is obviously no danger to the kid and means well, take your cues from the child. Always.
Some kids love that kind of affectionate attention from family in public greetings while others abhor it. In a future private moment, ask the child what type of greeting would be comfy for them and put your foot down (gently at first) to inform the overly enthusiastic adult what the new greeting form will be even if it’s only a handshake. Then STICK TO IT. Honor your child’s wishes in what he’s comfortable with and not comfortable with.
Even tho the relative in question might be offended, they’ll just have to get over it.
You are sending a very important subliminal message to your child. He has the absolute right to assert who does what with his body and you will back him up on that.
When I was doing face painting, it never ceased to amaze me how many parents of a reluctant child were willing to FORCE THEM to get their face painted. Most kids enjoy it and want it, but some kids just don’t like the idea of somebody putting cold goop on their face.
Granted, it’s not a “private” area but it is still part of that childs body and they should have veto power on who gets to touch it.
I just refused to participate even tho some parents were perfectly willing to put their screaming child on their lap and hold their arms down so I could paint them. Amazing.
I just looked them straight in the eye and informed them with a little smile that I don’t do any non-consensual face painting :)
Overcoming a child’s reluctance in any of these types of situations (whether with a beloved well-meaning relative or anybody else) is sending a horrible message to that child. It’s subconsciously letting them know that they don’t have final say about their own body.
I realize that people in these scenarios mean well but they aren’t clearly thinking through the larger implications.