Instructions
Start your game of "The Sims 2." Everyone who is a part of your household, regardless of if they are home or not, will be affected by the cheat code, so move out any Sims whose height you don't wish to change.
Press "Shift," "CTRL" and "C" to bring up the cheat code menu. It will be a small blue window at the top, left of your screen.
Type "stretchskeleton #" to increase the size of your Sims. You will need to replace the "#" with a numerical value. "1.0" is considered the basic Sim size, so start scaling your numbers up slowly. Too much and your Sims will be so tall you won't be able to see them.