Answer:
No, they're not.
Benson is Robby's birth name, and he married Karla DeVito (no relation to Danny DeVito) in 1982, and they have two children; a son named Zephyr Segal, and a daughter named Lyric.
Benson is Jodi's married name. Her full maiden name was Jodi Marie Marzorati, and she married Ray Benson in 1984, and they, like Robby & Karla, have two children; a son named Mckinley, and a daughter named Delaney.