Background - I get on well with my grandmother, we chat most days and I see her 1-2 times per month. Her and my sister do not get on. They had an argument years ago which resulted in NC. They do not follow each other on social media etc. I sometimes send grandmother pictures of my niece as she doesn’t see her much unless my mum takes her to see her which is maybe once a year. Niece is 5. My sister is fine with this and doesn’t have a problem with me sending them.
My sister was pregnant and has just given birth to my new nephew. Having girls myself and a neice was super excited got a new baby boy and took lots of pictures of him. I asked my sister if I could post them on Instagram as a couple of friends were asking how they both were she said yes (she’s not on Instagram) all fine.
My grandmother messaged me very upset that the pictures were posted on social media before she’d seen a picture of him. I apologised but was just so excited. She said it’s unforgivable and has now stopped talking to me. My mother had told her that my nephew had arrived, how much he weighed etc and not once did grandmother ask for a photo. My mum said it was a bit insensitive of me and my sister said she’s not getting involved.
Did I do anything wrong? Aibu? Not even my child so should be responsible for this?