A Vision of Friendship (My second book!)

Twilight and the rest think it's time to start a family on there own. They had declared that they will have a "vacation" as a excuse to close the School of Friendship for a while. After a few "years" they have children. What they are planing is that they want there children, once they get older, to go to the School of Friendship to make friends. What they don't know is that a lot of new friendships will be made there and also memories. But what will happen once all the children meet each other? Will they all face danger? And what help will they get from? But most importantly, who are they facing to save Equestria from?