When Good Morning America‘s Robin Roberts announced that she was diagnosed with and undergoing treatment for the rare blood disease myelodysplastic syndrome, many people flocked to her aid.

Sally-Ann Roberts, Robin Roberts’ sister has announced that she is a match and will be the sole donor for her sister. Roberts is currently undergoing chemotherapy.

Robin’s oldest sister, Sally-Ann, who anchors a morning show on the CBS station in New Orleans, says she and a friend made a prayer circle around the test kit.  “We prayed: ‘Please let this be a match,’ ” Sally-Ann said.