I overheard a conversation a while ago and still don't know what to do. When I first heard it I chose to ignore it but i am stressing about it now. Not word for word but it was something like A and B in normal chatter which I wasn't really paying attention to, then,
A then says something like 'just put a (mumbled) into her drink. That's what I do with [name of her partner]'
B (shocked) 'A! You can't do that!'
A says something about it being nothing, loads of people take it, something about it working when she wants an evening to herself, something about watching a film he wouldn't want to watch.
A is female and B is male and I'm related to both. Neither of them know I heard. I can't talk to anyone IRL about it. I think A is referring to a sedative. I know that both A and B have been prescribed the same medication.
I can't approach A about it because I've confronted her before about something and she lied direct to my face. If I say anything A will say I misheard.
A's partner has been very ill recently.