My list is:

Wilona Woods: Good Times(she loved Penny)
Roger and Nadine Thomas: What's Happening(Carolyn)
Peggy Bundy:Married with Children(Seven-for the time he was seen)
Mack and Karen MacKenzie(Knot's Landing/Jason Lochner)
Charles and Caroline Ingalls:Little House on the Prairie(Albert, James and Cassandra)
Mike and Carol Brady(Mike to Marcia, Jan and Cindy Martin) (Carol to Greg, Peter and Bobby)

Hayden Fox and Christine Armstrong on Coach.
Archie and Edith Bunker to Stephanie on All in The Family.

Beverly Ann and Andy on Facts of Life
Arnold and Willis on Diff'rent Strokes

Are there any other comments?

Steve Douglas..........My Three Sons
Beverly Ann ...............Facts Of Life

Uncle Bill to Sissy, Buffy and Jody on Family Affair.
Make Room for Daddy--they probably adopted each other's kids.
The Osbournes adopted the teen after his mother died.