I'm sorry it came to this, but I blocked my sister.
Wow, what happened? Why did you block your sister?
She was being very nosy and annoying.
Family relationships can be difficult, that's for sure, but I think it's very unkind to block her on social media. Your sister just seems a bit bored.
I just want to be left alone.
I understand, but if you want to be left alone then you should just take a break from social media for a little while. Blocking your sister makes it seem like she's done something terrible, and it could cause problems within your family.