Family Ties - Season 3 - Eps 16: Philadelphia Story
The Keaton family is transported back in time when Alex dreams he is at the Constitutional Convention at 1776, but history is off track. Steven Keaton is Thomas Jefferson and has just turned down John Adams' request to write the Declaration of Independence, so it's up to Alex to convince him to do it. Alex falls asleep while working on a college term paper on Thomas Jefferson and dreams that his family and friends are living 200 years ago.
About Family Ties

Title: Family Ties
First Air Date: 1982-09-22
Last Air Date: 1989-05-14
Status: Ended
Rating: 7.25/10 (from 238 votes)
Language: EN
Seasons: 8
Total Episodes: 168
Network: NBC
Genres: Comedy, Drama, Family
Production Companies: Ubu Productions, Paramount Television, NBC Studios
Synopsis
Former 1960s flower children Steven and Elyse Keaton raise their conservative son Alex, daughters Mallory and Jennifer, and later, youngest child Andrew.
Cast

Meredith Baxter
Elyse Keaton

Michael Gross
Steven Keaton

Michael J. Fox
Alex P. Keaton

Justine Bateman
Mallory Keaton

Tina Yothers
Jennifer Keaton

Brian Bonsall
Andy Keaton