I want to gift my grandnieces, ages 5 and 10, stocks. How do I make sure they get an equal amount when they turn 18?

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I am single and have no children. I have two grandnieces, ages 5 and 10. I want to leave them each an inheritance from investments that will become available when they become 18. I would like the amount they inherit to end up in the same ballpark. One child’s portfolio will have an additional five years of growth. Any suggestions?