Calgary Police investigators have shifted their probe south into the death of 5-year-old Nathan O'Brien and his grandparents.
Officers are in Mexico working with local authorities there.
Alvin and Kathryn Liknes had planned on moving to the country before they went missing, along with their grandson at the end of June.
There is one person already in custody, and facing murder charges in connection with the case.
54-year-old Douglas Garland faces two counts of first degree murder and one count of second degree murder.
Meanwhile, when it comes to Garland, the Crown has stayed identity theft charges against him.
Garland was initially charged with identity theft in a matter unrelated to the disappearance of the trio.
He'd lived for several years in Vancouver using the identity of a dead person and police alleged he was using that identity again when they brought him in for questioning in the missing persons case.
The bodies of Nathan and his grandparents have not been found.
Garland, is scheduled to return to court next week on the murder charges.
A stay means charges can be activated any time within a year if new evidence arises.