Herman Echevarria said on his Facebook page Sunday that their son, Frankie, was in intensive care following emergency surgery last week.
The message said Frankie was in stable condition; however, a source told The Miami Herald the boy's injuries were "pretty bad."
Alexia, who will return with the Miami cast for a second season, reportedly was camped out at her son's bedside.
Details of crash were scarce, but it appeared Frankie was riding in a vehicle that crashed Thursday during a rainstorm, the Herald said
The crash in Florida occurred less than a week after Russell Armstrong, husband of Beverly Hills housewife Taylor Armstrong, committed suicide.