It would be simpler for a newbie of wireless networking to go to the wireless settings and pick wpa-psk encyption (not wep) and set a password that you can remember. you have been suggested this a few times, yet you ignored the advice. it's just easier to do
don't say that you need it unsecured because you parent can't get in, because you can use your new password to log them in
change your network name too. you can disable the name from showing later
if your parent's wireless computer still can't find it your, update it to SP2