No, so long as everyone is on-board with what's going on, they should feel free to have a date or two.

Yeah. I would tell him "I know where you live" and walk away glaring

Not at all

[media=https://www.youtube.com/watch?v=YiJiqHhe8AU]

It would bother me if the relative was her dad or brother

yes. i would nip that in the bud as barney might say

I'd be like "stop staring"
"Dont talk to her, i know what you're fucking doing"

*brings her to family get togethers less & less*

A little but I would base my worries on trusting that friend or relative not to touch her or I'll stab them. 🙃

If I found out I would tell them to fuck off.

No. Touch her, I kill you. Hit on her, i hit you.