Chona Manzano, who is 35, and five-year-old Gabriel were found stabbed to death at a home after a neighbour called 911 in May 2013.
Neighbours described to police a vehicle seen leaving the northwest Calgary home.
That vehicle was stopped by RCMP in Didsbury.
Wilson Guevara Clorina pleaded guilty today to first-degree murder of five-year-old Gabrial and second-degree murder of Chona.
He also admitted to one count of sexual touching involving an underage girl.
The Crown and defence have made a joint submission for a consecutive term which would mean Clorina would have no parole eligibility for at least 35 years.
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