WICHITA, Kan. (AP) — Family members have identified a 9-year-old boy who was killed in a fire that seriously injured his mother and younger brother.

Jaden Nunn’s uncle Greg Parker tells KWCH-TV that Nunn was a strong boy who will be terribly missed. He was pronounced dead at his home on Wednesday.

Wichita Fire Captain Stu Bevis says Nunn’s 27-year-old mother and brother escaped through a window of the two-story home. They suffered burns, cuts and smoke inhalation before being taken to an area hospital in serious condition.

Fire officials are working to determine what caused the flames.