Is OTHER wrong in the post ? POST : So this all started when I woke up with messages saying my dad had just come out of surgery and my mum was suspected of having a cancerous mass. I live across the other side of the world from my family, and my main source of contact is WhatsApp. 

My sister's were as surprised as I was and in fact, we were all very upset that we had not been told about any of this happening. We were all messaging each other what little snippets we had been told, so obviously I started a group chat so we could all talk and trade information together. My sister's were all dumbfounded we had not previously done it.

Fast forward a day and I get home from work, and get a message from my mum (56F) saying that I went behind her back and she was leaving WhatsApp because of me, essentially cutting off all contact with me. One of my lovely sisters told my mum, who has a fantastic flair for the dramatic and literally feeds off tension and drama at times, and has now decided that what I did was unforgivable. I have not been able to get in contact with her, and my dad (59M) is awful with technology/ there is no way she won't see me calling so won't answer either, even though we are super close and he probably thinks my mother is over-reacting.

All my sister's support me and still believe it was necessary as we are all concerned and can never seem to get one story. But now I am isolated from my parents, all because I wanted to know that they were okay and started a non-malicious group chat about them. Am I the Asshole? Or did mum over-react and I just need to wait for it to blow over.

(Sorry that it's long)

Tl;dr: Parents lied about their health, I started a sister's group chat to talk about what we know to comfort each other and now my mother won't talk to me.