We don't know Yasmin's number of children yet, but let's represent it as Y.
If John has twice the number of children Yasmin has, then John has 2*Y = 2Y kids
If Gabriel has 6 grandkids between John's and Yasmin's children, then we can represent this as 6 = 2Y + Y
If we solve the latest equation then we learn that 6=3Y
Given that Y represents how many kids Yasmin has, then solving for Y we know that Y=6/3 or Y=2 kids
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