I would highly recommend NOT doing that. It will cause you untold pain in the future. You are proposing to violate normal form which will cause you far more pain than it will save. There is a reason you identify these tables as grandparent -> parent -> child. You will end up with a total mess on your hands. You are denormalizing your database to make it easier for queries. This comes at the cost of data integrity. Just my 2¢.
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