Social Media& Boundaries

I've cut all ties with my father and alongside my husband we both agreed he deserves no place in his grandsons life. He sexually and emotionally abused me my entire childhood and now as an adult I've emotionally come to terms with it in a way where I'm finally allowing myself to feel angry and hurt by what he did to me instead of feeling guilty for having these emotions, I know now it wasn't ever my fault. 
Someone on Facebook however is still providing him with photos and updates on my son. I'm in a good place and don't want to tell his side of the family why we aren't on good terms but they know we don't have a relationship and it's been tense for years. I don't know who is giving these things to him but would it be wrong of me to delete any mutual friends and family we share? I post pictures and updates for my family and friends them because we live in the southern US while they are all in Canada. It just really bothers me that he has even so much as a photo of my son, I don't think he has any right to even know what he looks like. 
Am I being unreasonable? Should I feel so bad for cutting out anyone tied to him? How would you approach the situation? 

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