Tyrone,
What Alejandro is suggesting doesn't include touching your brothers computer.
Logon to your server then do the following.
Create a directory;
mkdir -p /etc/e-smith/templates-custom/etc/squid.conf
add what you need to the file 90block_brother
vi /etc/e-smith/templates-custom/etc/squid.conf/90block_brother
(work it out from the suggested web page, make sure to allow al others on your network!)
Expand the template:
/sbin/e-smith/expand-template /etc/squid/squid.conf
If you get no errors then restart squid:
/etc/init.d/squid restart
I haven't tested this.
Craig