Dread to think what your kids are doing to them to cause such damage!
What you could do it buy a roll of self amalgamating tape and cover the cable and plastic parts of the connectors with it. Would make them much tougher.
Actually, my son stole my black duct tape and uses it for this. (black is cooler than grey, you know)
But you did give me a great idea. I used to roll my own cables, and still have all sorts of parts left. I should just take new cables and apply heat shrink and whatever else seems sturdy to 'improve' whatever cables we get.
And then maybe some ECT.