Is It Possible to Transfer Fats from my Sister's Body to my Butt?

Because you are not an identical twin, you cannot safely transfer your sister's excess fat to your buttock.  Yes, in the cases of critical organs such as kidneys, livers, lungs, hearts, etc., transplants are performed from one unrelated donor to a recipient but this can only be done by using very strong medications that impair the recipient's immune system from rejecting the donated organ.  While these medications are lifesaving, they do carry high risks for increasing the recipients inability to fight off other life-threatening illnesses and therefore only used in such situations.  

Hello dear!
Thanks for the question and provided information as well.
No, this is not possible. A BBL is performed using your own fat tissue.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

The answer is; no. but you may be surprised how much can be done using the fat you have at your disposal. Some of my best results were on very thin women. It’s a matter of shifting storage areas not just filling the butt. Consult a local board certified plastic surgeon who performs lots of Brazilian butt lifts and listen to the risks carefully before having any surgery performed.