I am having a REALLY hard time choosing only 5, as I think there are enough for a top 10 that I all enjoy equally.
1. The Wonder Years
2. Facts of Life
3. Family Ties
4. Full House
5. Friends (why do these all start with F??)
Honorable mentions: Perfect Strangers, Malcolm in the Middle, Happy Days, Brady Bunch
I will note that I don't actually enjoy all of the shows themselves, for example I really don't much like the Brady Bunch, but the song is just so memorable.