CHICAGO (CBS)--A father and son were found fatally shot in a home in suburban Riverdale on Sunday.

The shooter spared the life of a toddler who was also found in the house.

Shortly before 4:30 a.m. on Sunday morning, Riverdale police responded to a call in the 13000 block of South Indiana. Two victims found inside the apartment were identified as Vincent Martin and his 25-year-old son Marquell Carter, police said.

According to police, Carter and Martin were in the apartment when an argument broke out. A relative found both men, police said.

Martin's 2-year-old child was unharmed.

"He was like a father to me, and for them to do something like this you have to have no heart--no heart at all," said Jessica Scott, Martin's niece.

Riverdale police said the family was targeted and that this was not a random crime.

No arrests have been made.