Can I use someone else's body fat and if so is it harmful?

Thank you for your question, it isn't possible to use someone else's body fat for a Brazilian butt lift, when a patient doesn't have enough fat I can often advice buttock implants as a solution, however an in person consultation can be done with a board certified plastic surgeon, for a better examination and estimate of the total cost.

Unfortunately, you can only use your own fat for a fat transfer. However, you may be surprised at how much fat you have to transfer. It may be a good idea to consult with a board certified plastic surgeon who specializes in the BBL and performs at least 6-8 per week. Best of luck

The fat from another person will not survive in you.  An exam would be necessary to determine if you have enough fat to transfer.  Buttock implants are always an option, but I have performed the BBL on runway models with nice results.Try to research this to find the surgeon who consistently produces the
results you would expect. Look at reviews on this site and see who gets the surgery right every time. Find
a board certified plastic surgeon who performs hundreds of Brazilian
buttlifts each year. Then look at the plastic surgeon's
website before and after photo galleries to get a sense of who can
deliver the results. Kenneth Hughes, MDLos Angeles, CA

​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 :)

You have a very creative thought process. However the use of another family members fat to be transferred into your gluteal area would not be safe. This transferred fat would resorb, cause an inflammatory reaction, and possibly lead to infection. In summery "good thought but bad idea."