A couple fighting about which gang their 4-year-old toddler should join caused a public disturbance that resulted in the father's arrest, Commerce City police said Thursday.On Saturday, Joseph Manzanares stormed into the Hollywood Video store where his girlfriend worked, threatened to kill her and knocked over several video displays and even a computer, Commerce City police Sgt. Joe Sandoval said.After he ran out of the store, police were called and the 19-year-old was arrested at his home.His girlfriend told police that they had been arguing about the upbringing of their son and which gang he should belong to. The teen mother, who is black, is a member of the Crips. Manzanares is Hispanic and belongs to the Westside Ballers gang, the woman said."They have different ideas on how the baby should be raised. Basically, she said they cannot agree on which gang the baby would 'claim,'" Sandoval said.Manzanares was charged with disorderly conduct, harassment, and domestic violence. He was transported to the Adams County Detention Facility.On Tuesday, he pleaded guilty to disorderly conduct and was sentenced to a year of probation. The misdemeanor harassment charge was dropped.