Should I tell my sister or am I overreacting?

[Username22344]

My sister is not on facebook, I am and I have her husband as my friend. I came across this girl on facebook and I checked her profile as we had a few friends in common. My brother in law is constantly liking her pictures, including a few where she is nearly naked (she is nearly 20 years younger than him!). They are not "friends" on facebook at the moment, maybe they were at some point, or maybe he just liked her pictures because everyone can see and like them, I don't really know.I know that they know each other because she works (not sure if she still does) with him.
Now I know not everyone has an issue with this sort of thing, personally I would have, if it was my partner! I don't trust him and don't think he really cares about my sister or the kids! Unfortunately my sister doesn't seem to see it the same way I do!

So my question is should I tell my sister? Or is this not a big deal? Really need everyone's opinion please.
Thank you!

They aren't friends anymore and I would not think it's a big deal.
You know them best though.

you did used to be able to see friend relationships on fb...it might be worth having a nosey to see what you can see

If you would want your sister to tell you- then tell her

Maybe keep an eye on it for now, if they're not friends then they can't be that close, does seem he's probably perving and Liking her pictures because she's young and without much clothes on! Doesn't mean she likes him in return though, so might do more harm than good.
If she equally likes his posts a lot then, I would worry more.

Maybe your sister already knew and had a problem with it hence him not being friends with her anymore. I would tell my sister because if anything ever come out and I knew I know she would ask me why I didnt mention it. Also my sister called me straight away when she saw something she thought I should know. So yeah I would mention it to her.

He sounds like a sad old creepy letch - making a fool out of himself. Doesn’t sound like they are in a RS.

She doesn’t see what you see - in-fact what do you see - because YOU have gone way out of normal parameters to dig this up. She doesn’t feel the same as you do and you are at real risk of blowing up your RS. Messengers get shot - but you don’t even have a message. She might see you as trying to sabotage her marriage.

I don't trust him and don't think he really cares about my sister or the kids! Unfortunately my sister doesn't seem to see it the same way I do!

If you would want your sister to tell you- then tell her

^This. I would tell my DSis something like this and she would tell me, as we have each other's backs. She might be okay with it, but it's her decision to make, once she knows about it

Sssloou I checked her profile because some of my friends are friends with her! She posts a lot of pictures and his name kept appearing in every single picture, that's all. I wouldn't have noticed if I had to click on the picture and then check the list of who likes her pictures, but because he is my "friend" it says straight away without me having to click on the picture or list. I have reasons to not trust him, obviously is not just based on this! I am not the only person in the family who thinks this. It's also not the first time that he is interested in someone he works with! I even confronted him once and he admitted it! My sister should have left him many years ago, unfortunately she allows him to do and say whatever he wants.

I wouldn't say anything too be honest but maybe keep an eye out just in case.

Lots of men 'like' and comment under random girls pics. Telling your sister might create a drama over nothing and you'll end up being the bad guy.

bring to to her attention... let her come to a decision on whether it needs further investigation or ignored...

I would assume she already knows and that's why they're no longer friends. You could name drop her and see what your sisters reaction is, if you're worried about diving straight in with it