Melissa Sue Anderson in Little House on the Prairie (1974)

Michael Landon and Eddie Quillan in Little House on the Prairie (1974)

Dean Butler in Little House on the Prairie (1974)

Eddie Quillan in Little House on the Prairie (1974)

Melissa Gilbert and Dean Butler in Little House on the Prairie (1974)

still from 'Little House on the Prairie' - The In-laws (S7.E9)

Melissa Gilbert and Karen Grassle in The In-laws (1980)

Michael Landon, Patrick Labyorteaux, and Merlin Olsen in The In-laws (1980)

Melissa Sue Anderson, Michael Landon, and Dean Butler in The In-laws (1980)

Michael Landon and Dean Butler in The In-laws (1980)

Michael Landon and Merlin Olsen in The In-laws (1980)

Karen Grassle and Alison Arngrim in The In-laws (1980)

Chad Cowgill, Terrence Evans, and Patricia Herd in The In-laws (1980)

Michael Landon and Karen Grassle in The In-laws (1980)

Melissa Gilbert and Dean Butler in The In-laws (1980)

Melissa Gilbert, Michael Landon, and Dean Butler in The In-laws (1980)

Chad Cowgill, Terrence Evans, and Patricia Herd in Little House on the Prairie (1974)

Chad Cowgill in Little House on the Prairie (1974)