Unrealistic (Real life context) -- This could mean a primarily real-life basis but that your sims live idealistic lives in ideal worlds. You may or may not have occult life states in your game, and your sims likely never age or die (from any cause).
My sims live a totally drama free experience. Mom and Dad have jobs, raise their children, assign chores, help with homework, and provide guidance. There is a lot of socializing with extended family, family vacations, movie nights, family dinners out, date nights for Mom and Dad.
Where it gets unrealistic is that Mom is a master caster, master duelist spellcaster. I also haven't had a family member or extended family member die. There are no age norms or constraints in my game. I've had a mother and daughter who were both young adults. My toddler has been a toddler for 4 years. My sims do age up but only when I feel it's the right time.