The detail that shows Genie's feelings about Grandpop is that Genie thinks Grandpop has a tight handshake.
What is Handshake?
People often express their feelings in different ways. Handshake is known to be a way that is used to link people together. It is the act of shaking someone's hands. It often means friendship.
Conclusively, The detail that depicts Genie's feelings in terms of Grandpop behavior was that Genie believes that Grandpop grip when doing a handshake is too much and she does not like it.
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