Valentin-Colon's stepfather told WFTV that Buffalo police confirmed the identity of the bodies in October, but the family didn't get the remains until November.
Valentin-Colon was buried in Puerto Rico, and Plaud was cremated in Orlando.
Investigators have not yet released how the couple was killed.
Officials are still investigating the whereabouts of the third adult, Dhamyl Roman-Audiffred, who was with the couple and the child when they left Central Florida, authorities said.
Police released surveillance video in September of two people of interest in the case, showing the two men and a child running away from the burning van.
The identities of the people of interest still aren't known.