The pair of siblings who survived the brutal hammer attack that killed their mother in their Brooklyn home last week are now on the road to recovery. Background: David, 5, and Sophia, 3, were critically injured after Liyong Ye, 43, allegedly attacked their family with a hammer on Aug. 23. The incident took place in a three-bedroom apartment in Sunset Park, which was shared by the family, Ye and his 9-year-old son and a third individual.