Firefighters removed burned pieces of insulation that caught fire in the attic of a home on the 300 block of Imperial Avenue on Monday.
Extensive damage to the attic and kitchen prevented the family from returning to the home.
The Red Cross is helping three adults and two teens with emergency lodging and emergency food and clothing. They also received comfort kits and referrals for new housing and other help.
Authorities say the fire appears more than likely to be accidental.