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Hello and thank you for your question. The individual would be very different than their grandparent since they are a unique person with their own life. So only a small aspect would most likely be like their grandparent, but this is also dependent on how the individual lived their life and how they responded. Individuals have a unique set of experiences that shape them into the person they are today, so it would be near impossible to replicate these experiences to others, which is why every person has unique differences. So while there is no firm percentage of how different one is from a family member, most people would only retain a small aspect of their grandparent's personality, but this is dependent on the level of relationship an individual had with their grandparent and the individual's unique set of experiences growing up.