Police are concerned for a four-year-old boy not seen since Friday.
Suren Stepans was last seen at an address on Addison Street, Blackburn.
Suren is believed to be with his parents, Maruta Stephan, 25, and Artus Brezouski, 29 but police are concerned for his wellbeing.
The family are believed to be somewhere in the East Lancashire area, possibly with links to the Latvian community.
Suren is described as slim with short brown hair and brown eyes.
Det Insp Paul Barlow, of Blackburn Police, said: “While we believe Suren is with his parents, we are concerned for his welfare and I would appeal for anyone who sees them or who knows where they might be, to get in touch with the police.”
Anyone with information should contact 101.