lots of progress made since 15years ago when the cord blood was first introduced to cure some kinds of blood cancer,the technology of amplifying of cells and types of disease have been improved a lot, i hope it could be more useful in the future...although i still hope that i dont have to use it and my kid will be healthy...the only thing concerns me is that the private bank in canada doesn't provide any guarantee in the agreement, but that's not only canada...so no choice, i just dont want to regret i didn't do it in case one day i might need it....as the example you said about another kid, it really depends, the match of stem cells among siblings is only 20% unless you do a test tube to make sure it's matched before planting it into your uterus...also your body condition for pregancy and have to wait for 9 months, etc....of course, it's all personal choice.