The father called police at about at 2:30 a.m. to report that he had been stabbed, according to Daly City police Sergeant Mike Barton.
Daly City police responded to a residence in the Crown Colony apartment complex on Imperial Way and found both subjects suffering injuries.
The father had been stabbed four times and the son had sustained trauma to his head, Barton said.
Both the father and son were transported to a local hospital to be treated for their injuries, which police said do not appear to be life threatening.
Barton said no other residents were home to witness the altercation and both subjects remain at the hospital this morning.