Backtrack (A FMA Fan-Fic)

Every great story must start and end somewhere. It can't continue on forever. The same with humuncoli. Although they're "immortal" beings, their time must come to a close sometime.
Èclair Elanie-Elric has been enjoying her days together with her two young children, Everlette and Eric and of course, her husband Ed. They were finally "settling down" from their crazy out-there lifestyle. However when Envy makes a reappearance, everyone knows something is wrong. The part of a philosopher's stone that liquidfied when it smashed went missing. But to make things worse, this wasn't any ordinary stone: this held some forgotten memories of thr lost humuncoli. If the vial was to arrive in the wrong hands, all of Amestris could be in peirl.
And with the new threat of the humuncoli being discovered, they all start to creep out of from whence they lived to eliminate the thought of humuncoli and find the vial before it's too late.
Just who gets sent in to attempt to stop all madness before it starts? The Fullmetal and Halfmetal Alchemists.