My sister and her husband split a few years ago.
They have a child that he manipulates to get information from about my parents/me.
I blocked him from my phone/social media/life when they split because it was a bitter divorce and was getting spiteful.
I bumped into him a few months ago when I was very pregnant and the next day (and once a week on average) he sent me a message on a fake social media profile saying he felt sorry for my child how could I bring them into a family like mine. So again I blocked and set to private no notifications and such.
Since baby has been born my Niece has met him and taken photos with him.
These photos have appeared on social media with photoshopped marks on his face saying I've dropped him/abused him and the baby should be taken off me.
I feel my Niece needs protecting from her father but obviously not my position to say.
Would I be unreasonable to also block my Niece from my life and ask my sister not to give her any information about me?