If Kiran is sitting under a tree and Jia is hanging upside-down from a branch of the same tree, how does gravity affect each person when Jia drops an apple?

Respond very briefly.
Gravity will pull the apple straight downward. Since Kiran is sitting under the tree, and gravity acts towards the center of the Earth, the apple will fall towards Kiran. If the apple is dropped from directly above Kiran, it has a chance of landing on or very near to Kiran, depending on the accuracy of where Jia releases it. Meanwhile, Jia will remain hanging from the branch because she is supported by her legs, which are presumably hooked around the branch, and gravity will continue to act on her downwards, towards the Earth's center, although she does not fall due to her support on the tree branch.