The three, who are presumed to be dead, have not been seen since the end of June when they were discovered to be missing from a home in southwest Calgary where a violent incident took place. No bodies have been recovered, but police have said there is evidence that the three are dead.
Last month, 54-year-old Douglas Garland, who was previously considered a person of interest in the case, was charged with two counts of first-degree murder and one count of second-degree murder.
Garland’s sister, Patti, is in a common-law relationship with Alvin Liknes's son.
Police have already conducted an extensive search of a rural property near Airdrie, north of Calgary, owned by Garland’s parents.
Police have not said exactly where the officers are or what they are looking for in Mexico.