The man charged with killing six children and a couple at their home in a Houston suburb had a previous relationship with the woman he is accused of killing, and at least one of the murdered children was likely his own, authorities said Sunday. Valerie Jackson, 40, her husband, Dwayne Jackson, 50, and six children — Nathaniel, 13; Honesty, 11; Dwayne, Jr., 10; Caleb, 9; Trinity, 7; Jonah, 6 — were found shot to death in three bedrooms of their Harris County home Saturday night, Harris County Chief Sheriff's Deputy Tim Cannon said. Some had been handcuffed, and some were shot multiple times, Cannon said. David Conley, 48, was charged with multiple counts of capital murder. Officials originally said he was suspected of killing five children and three adults.