Police Scotland today confirmed they were treating the death as "unexplained".
Sonny Kiernan - the younger of the actor's two children - was found dead at his parents' home in the West End on Monday night.
It is understood he was found in his bed.
Police have confirmed they were called to the luxury property at 11.30pm on Monday.
A spokeswoman said: "Police received a report of the death of a 12-year-old boy in Cleveden Road, in the Kelvinside area of Glasgow.
"A post mortem examination will be carried out in due course to establish the exact cause of death.
"The death is currently being treated as unexplained.
"Inquiries are ongoing."
Ford, 51, lives in the house with wife Lesley, 44, and their daughter Kaye, 15.
The family recently moved in after selling their five-bedroom villa in Pollokshields in November.
The tragedy comes after Ford and his comedy partner Greg Hemphill reunited and announced plans for a Still Game comeback at Glasgow's Hydro arena.
Still Game was a massive hit when it ran between 2002 and 2007. The run of lives shows will star in the autumn.