They are not on my social media, I have already removed anyone I didn’t want to have access.
I’ll try to make the story as short as possible as to why........... 
My partners sister have never liked me from day one (I don’t know why) (both in there 30s - one still living at home)
We have had issues with them being rude to me on several occasions. My partner normally tells them to grow up etc. And we tend to leave shortly after. There has been family get together a I haven’t been invited too as well.
We had been to my mother in laws for a BBQ to celebrate my step daughters 13th. the sisters made it clear they were going to ignore me. Talked to everyone apart from me. Offered drinks to everyone except me. They then started to walk into me and push me on purpose. I told my partner and she told me I was doing well ignoring it etc.
My son had been with me the whole time. Then my step daughter whispered something to someone outside which I overheard. Basically the sisters wanted everyone together except me for a photo. (Including there own partners etc, just not me)
I told my partner I’m leaving with our son. Her and her daughter could stay if they wanted but I’m not staying around to listen to any of it and be picked on.
We all left together in the end.
We had a row over Facebook to which I was told that I had caused the issue and I hand on heart was nothing but polite. The row ended and was left to the fact that I and my son would have nothing to do with them. They told me I was not allowed to even mention there kids in future so I told them to leave my and my son alone.
I have never stopped my partner seeing them, nor my step daughter (although this causes issues as they still make horrible remarks about me).
The mother law was also disgusting to me, we tolerate each other now but I’m not going to do the things I used to do for her (fix her car, wash patio etc)
To add a little more pretext to the situation. My partner was in an abusive relationship for many years - even when they split he tried to control her. This extended to the mum. When I got with my partner I told this person that he could no longer do this and now I’m
with his ex he will not be able to control her. This resulted in him attacking me, trying to control the daughter, controlling finances and stalking. It took a lot of work but I got her out of the situation by working with police, solicitors and finally a court hearing to get an order that he wasn’t allowed to contact her. In doing this I upset the family some how as it restricted my step daughter seeing her dad. My mother in law didn’t seem to care that I had stopped this nasty man from being able to threaten to burn the house down, punch my partner, give her black eyes, steal her money, damage her car and also sit outside her house watching. (This is no over exaggeration - the neighbours even used to call the police. She even stopped getting the calls at 2am saying I love you and then 30 mins later how he’s gunna kill her.) he used to masterbate outside the bathroom door when he was there and she was in the shower. Even when his daughter was downstairs. Several times he had done worse.
What annoys me is the mum and sisters never helped her get out of it. 
Anyway - all this meant my partner spent time with me and we started building a life. No longer could they get her to pop round and do this or that. I guess they saw her less but not because I told her she couldn’t do these things just because we were loved up and wanted to spend all that time together (as you do in honeymoon period)
They still keep in contact with this guy also - we have moved now and do everything we can to stop him finding out where we have moved too. We can’t have virgin media as he will find us on the system as he works there. (He used to turn off her WiFi, tv and when we got a new account to stop it he text her the new landline and just basically stalked)
Some where in all this I was disliked - which resulted in a stand off and the removal of them from my sons and my life and vice versa.
So if they have got a photo of my son from my own personal photos then I would be upset. If they have got someone else’s then I can’t do anything about it as it belong to them.
Ps one of the sisters does photography so would understand copyright etc. Especially for a commercial project which this could be construed (loosely) lol.
Thanks for making it to the end....