@targanna - Thanks for the question. I am certain that many people will respond with helpful comments, but the short answer is YES, living donation for liver transplant is a possibility. It would depend on where your brother is listed for transplant (do they have a living donor program?), do his doctors think a partial liver will work for him, and do the people who come forward as donors qualify to donate. You can read more about liver transplant and living donation in our toolkits found here:
Living Donors: https://connect.mayoclinic.org/blog/transplant/tab/resource-36/#ch-tab-navigation
Liver transplant: https://connect.mayoclinic.org/blog/transplant/tab/liver-transplant/#ch-tab-navigation
My best to you and your family!