When to tell other child and family the news

Krystal • In love with our lil peanut due Oct 17 2015!
So I'm going to be 8 weeks pregnant tomorrow and we want to tell our daughter so bad that she is going to be a big sister... I also haven't told my parents yet and don't know how... We ended up moving 1200 miles away from them and they are coming to visit next month should I wait until they come or tell them over the phone ?? Any suggestions ? :)