My Three Sons Season 9 Episode 16 Chip and Debbie ( Air Date 1969-01-18 ) Genre Comedy, Family category. Overview "Chip and his girlfriend announce to a startled Douglas family that they plan to marry and continue high school. Disapproving, Steve visits the girl's parents but they decide not to forbid the marriage but wait for further developments. When Katie becomes ill and Robbie takes her to the doctor, Chip and Debbie are left with the triplets for some hectic hours.".