A 49-year-old man and his 22-year-old son are in custody Monday on suspicion of carrying out a home invasion robbery in Lemon Grove and shooting one of the occupants, leaving him critically wounded, authorities said.A man who lives in the home in the 1800 block of Bakersfield Street was shot in the abdomen, according to the San Diego County Sheriff's DepartmentDeputies were called to the home at 10:16 p.m., he said. What was initially reported as a hot prowl was quickly upgraded to a home invasion robbery, then a shooting, according to Jeff Weiss, a communications supervisor with the San Diego County Sheriff's Department.Witnesses told deputies they saw two men fleeing with guns in a vehicle that had a flat tire. The flat was apparently caused by one of the witnesses who intentionally punctured a tire before the gunmen fled, Weiss said.The suspects were identified as Gregory Alan Jewell and Joshua Alan Wineski. Weiss said that two firearms were recovered from inside their vehicle.A sheriff's spokesman confirmed that a witness, who was inside the victim's home during the robbery, punctured the suspects' tire before they escaped.A responding deputy heard a vehicle being driven in the area with a flat tire and radioed for help. The vehicle was pulled over near Lemon Grove Avenue and Broadway, and two men inside were arrested, Weiss said.Neighbors said sheriff's deputies were called to the home Saturday as well. A sheriff's spokesperson confirmed there was a burglary call in the area, but said it was not connected to Sunday's home invasion robbery. According to the sheriff's report, the items reported stolen in the burglary include video games, books and an electronic notebook.The victim is currently listed in critical condition.