Police said three men dressed in black "grim reaper costumes" knocked on the door of a home near 17th Avenue South and South Ferdinand around 9:15 p.m.
When the family opened the door, the men pulled out handguns and made their way into the home.
The gunmen forced a man who lives at the home into a bedroom where they took "a large amount of cash, gold earrings and a necklace, and a CD wallet," according to police.
The men fled on foot, heading east on Ferdinand, and remain at large. A description was not available.
No one was injured in the incident.
Anyone with information on the case is urged to call police immediately at 206-684-5535.