As all Kids, mine also love elektronics. But loving also means taking care. And taking care also means repairing them: themselves.
It is not the first time we repaired an iPhone, but we realized last time, that good tools, are half the way.
We use YouTube Videos for instruction. that is sufficient.
Metal Spudger Set
P2 Pentalobe Screwdriver iPhone
iFixit Opening Picks set of 6
iSesamo Opening Tool