Five years ago OH and I were invited to joint his brother and wife in a short holiday break in the UK. When we arrived brother was alone as his wife wasn't well and stayed home. I'd never met him before btw.
One evening whilst we were out for the evening the brother was on the wrong side of alcohol and was behaving rather inappropriately towards me when my OH wasn't close by. At the time I let it go and ignored the lechy comments.
Brother has now left his wife, taken up with another, rather wealthy woman and moved very close to where we live. He phones and messages OH regularly and it looks highly likely, once lockdown is finally over, that he will expect for the four of us to get together and socialise.
I'm not at all comfortable with this, his lady friend seems very nice and appears to be funding their lifestyle, he's apparently drinking heavily and I know from past experience, just what he's like when he's 'in drink'.
I've never mentioned the brothers behaviour to my OH and I know, eventually, I will run out of excuses to not visit them or have them visit us.