Posting pictures of other people's kids to social media

S
so ever since our son was born (literally the day after he was born) my sister in law came to see us in the hospital (which was very nice and welcome) but without asking posted pictures of our son to social media. she did the same several times since and it bothers me. Does this bother anyone else? I never have and never will do this to someone else without the permission of the parent no matter who it is. She does tag us in the post which is nice but still not 100% sure how to feel about it.

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