Phillip Bernal, 12, and Sarah Wolfe, 8, were killed at a relative's home on Edgeboro Street.
RELATED: 2 kids killed in murder-suicide in NE Harris Co. identified
2 kids, man killed in apparent murder-suicide in northeast Harris County
Deputies say Sarah's father, Cimarron Wolfe, 38, shot and killed them both before turning the gun on himself.
Sunday's benefit is to help the family raise money for funeral costs. It will be held until 5 p.m. at the Hawg Stop off of Sheldon Road.
There will be barbeque and live music.