Nothing could’ve prepared us for what happened. Millions died in a matter of weeks in Equestria alone. Billions, across the world. Equestria was devastated. Nowhere was spared. Without food water or power, cities like ours became wastelands. We were just an ordinary family but pretty soon we realized if we wanted to survive then we needed to leave the city. We thought we were leaving the worst behind us, but we were wrong.
P.S. It will take a few chapters for all main characters to be introduced into the story.
Chapters (1)
It's pretty good, but you have a bunch of tiny grammar errors all over your dialogue. For example,
The comma is after the quotation in that one, and there are lots of similar mistakes. You should probably go over this again or get an editor from one of the editor groups.