Keep an eye on them when they get older. If they do have it then God willing you would be able to get them into the rooms, get a sponsor, work the steps and recover young!
In the meantime you do the same and then you will be the role model for them you want to be:-)
As for how to put that phrase when telling them, when they are older after reviewing your motivation for sharing this with them, with your sponsor...use whichever phrase your sponsor suggests.