lol just found this, when I was younger I used to hide everything from my mom, i'd do loads of crazy stuff like:
Put the roof up when you think it is something she will shame you for XD
Scroll away as fast as!
Turn the laptop screen just a touch away so she can't see your sim get in the shower LOL
Skip the underwear outfit chooser (yes, my mom was strict!)
Say you can only adopt babies
Hide the 'kiss','hug' and flirt Ect. actions

LOL my mom was strict!

I found out the hard way that it's wise to warn young children in advance that if they don't take good care of their Sims, the Grim Reaper will come and he's a very scary dude. >_>