I would hold on to them. You probably won't see a windfall if you try to sell them.
You could use those chips and teach the yutes you know how to play different poker variations, whether it is Hold'em or Stud or circus games. Then you could gift them the chips when they are old enough. Hopefully you and poker make a lasting impression on them so they play later on in life. Pass it along!
Or you could use the chips in board games like Monopoly.
Just my unsolicited opinion....