Kim Cantin, Jack's mother, said his remains were discovered within a thousand feet of where the family's home once stood.
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She told KEYT-TV that his remains were found around Memorial Day not far from where the family's former home was destroyed in a Jan. 9, 2018 mudslide.
Jack Cantin's father, Dave, was also killed, and their home was destroyed.
RELATED: Names of Montecito mudslide victims released
Names of 17 Montecito mudslide victims released
The slide followed heavy rain that swept boulders, trees and debris from a previous fire down a nearby mountainside, destroying hundreds of homes.
In all, 23 people died in the mudslide.
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The remains of another victim, 2-year-old Lydia Suttithepa, still haven't been recovered.
The Associated Press contributed to this report.