u/Ass______Man

Hello all. I have an opportunity to take a clipping of what I believe is a grapefruit tree, it’s owner told me that it was grown from a seed over 55 years ago and has lived in this pot ever since, indoors, only ever going outside in Northwestern Pennsylvania Summers.

Based on these pictures, I would like to know where might the best spot be to take a clipping, and what I would need to do to try and nurture it into its own new tree. Please let me know any in all thoughts you have, thank you!