<p>after all in the family made their television debate , other situation comedies began to explore a variety o social issues
The answer is their, why ? 
</p>
<p>Because All in the Family is the title of a TV program, and a title is treated as a singular. The word “all” doesn’t change that. “their” should be corrected to “its.”</p>
<p>Thank you alot</p>