JEANNETTE, Pa. (AP) — A 2-year-old boy with only weeks to live will serve as best man when his parents wed this weekend.

Sean Stevenson and Christine Swidorsky, of Jeannette, had planned to wed next year but decided to move the ceremony up to Saturday so their son, Logan, who has leukemia and other complications, could participate.

“We want Logan in our family pictures, and we want him to see his mother and dad get married,” Swidorsky said. Her 13-year-old daughter from a previous relationship, Isabella Johns, will be a bridesmaid, and the couple’s 1-year-old daughter, Savannah, will be the flower girl.

Logan has Fanconi anemia, a rare disease that often causes cancer. He was diagnosed with acute myeloid leukemia at 14 months old and had a stem cell transplant a year ago. He lost one kidney to a tumor in March and now has a mass on his other kidney.

Last week, doctors told the couple the boy would live only two to three weeks more.

“It’ll be the hardest thing I’ll ever do, is bury my son,” Stevenson said. “You know it’s coming, and you can’t do anything about it.”

Family and friends have pitched in to organize the wedding, while Logan spends his last few days resting in his parents’ home.