"She truly loves him," Anderson said.
Duchene feels the same way about Haven, whom he met at a Hockey Fights Cancer skating event early in the 2014-15 season.
"She's one of those people that just brings so much happiness and joy into your life with her smile," he said.
This love, this bond, has fueled Duchene's passion to help fight pediatric cancer, the kind that has affected Haven since shortly after she turned 2 years old.
Haven is battling stage four neuroblastoma, a rare form of cancer often found in the adrenal glands that typically affects children who are five years old or younger, according to Kidshealth.