Star Trek: Voyager - Season 3 Episode 22 -

The Doctor creates a holographic family, but B'elanna Torres thinks the Doctor's simulation is too "nice" (in a "Leave It To beaver" sort of way). She introduces some alterations to the program to make the simulation more accurate to real life: a wife who often disagrees, a rebellious teenage son, and a daughter who is sure she knows better than her doting father. When his daughter is critically injured the Doctor must make a choice, run back to his Voyager life, or face the harsh "reality" of losing a loved one.