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Your son-in-law is the husband of your daughter. His son is your daughter's son and therefore your grandson, and you are his grandparent.

If your son-in-law's son is from a previous marriage, the son is not physically related to you. He is your daughter's step-son, he is your step-grandson. However, you may want to treat him like a grandson anyway, especially if he came into your life at an early age.

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10y ago

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