Meredith Baxter Meredith Baxter

Meredith Baxter will guest-star on ABC Family's Switched at Birth, has learned exclusively.

Baxter will play Bonnie Tamblyn Dixon, the mother to  Lea Thompson's character Kathryn and biological grandmother to Daphne (Katie LeClerc). Sparks fly and tension arrisses when she arrives for a family visit.

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The guest spot also marks a reunion between two of Michael J. Fox's fictional mothers; Baxter was his mom on Family Ties while Thompson played his mother in Back to the Future.

Baxter will appear in one episode when the show returns Tuesday, Jan. 3 at 8/7c.