Five-year-old Kerry Anglin and his eight-year-old sister, Karly Mooris, went missing just before 7pm in the 2500 block of 37th Avenue North, police said.
The children were dropped off at their home around 10pm, police said. According to officials, they had been with their grandmother at a chuch revival.
A phone alert to Texas City residents was issued around 8:40pm.
Police set up a command post where the children were last seen and conducted a search of the area.
Officials said their great-aunt reported them missing. She is their guardian.
A family member tells us the grandmother told a relative she was taking the kids with her, but that person did not hear her.