Authorities in Texas have arrested one man and are searching for his father in the fatal shooting of four people -- a 62-year-old man and his three grandsons in their 20s -- at a toddler's birthday party, Sgt. Nathan Brandley of the Texas Department of Public Safety. Police responded to reports of a shooting at a 1-year-old's birthday party in Taft, north of Corpus Christi, and arrived around 5:15 p.m. Saturday to find four men dead in the back yard of a house,

Brandley said. Children attending the party were mostly inside the house, he said. One handgun was involved, he said. Those killed were identified as Juan Espinoza Sr., 62; and his grandsons Juan Sandoval III, 20; Jeremy Sandoval, 22; and Nicky Sandoval, 25. All were from Taft. Juan Espinoza Jr., 43, the elder man's son and father to the three younger men, was airlifted to a hospital in Corpus Christi, Brandley said. He is critical condition but is expected to survive, Brandley said. Watch video below