It could be a good idea to set aside a small amount for grandchildren. They may benefit from the gain in value more then we will or even our children will. I'm setting some aside anyway whether it's for me later or to pass on.
Yeah I am going to save some for them if it is going to make sense because you never know what might happen to Bitcoin.
Maybe it is just better to trade in the Bitcoin and leave some money behind for them instead of Bitcoin.
That is a conservative way of saving money for your grand children. However, I believe it will be even ok that aside from saving fiat money (subject to inflation) and a portion of your bitcoins, for grankids is wise. Why, because bitcoin may increase its price in the years to come - it will be bigger in value than your saved money that loses value always due inflation.