Lance Irvin, a member of the influential Irvin basketball family, underwent successful stem cell surgery Tuesday at the University of Chicago Hospitals, with an assist from brother Mike.
On Monday, Mike Irvin had stem cells removed from his bone marrow so they could be transferred to Lance.
Leukemia for more than a year.
Their father, Mac "Godfather of Chicago Basketball" Irvin, died of complications from diabetes in December.
Another brother, Morgan Park coach Nick Irvin, said Mike has been released from the hospital and Lance should be out within a week.
"They're doing real good," Nick Irvin said.
Nick said Lance was traveling with the Fire on the summer circuit this year when his symptoms recurred.
Mike was the first person tested as a potential donor, and he was a match.
According to a statement released by the family, they are "choosing to go public with the successful stem cell transplant surgery to bring light to other African-Americans about the need for blood, organ and tissue donors within the community."