You might also wish to put this in your profile page and perhaps in your hubs as well so that strangers can also sign up under you. Create a link by doing this:
(Separating it so that it does not look like a link as it is not allowed in questions, so just put it together with no separations when actually creating it.)
http: // hubpages . com /_xyz/ user/ new
Substitute your default tracker (or create your own tracker of choice)...in the "_xyz" area of the website.
Go to My Account, then Earnings, and under Earnings you will find Trackers.
Nice that your sister wants to join HP under you as well as others in your family. I like your hubs, BTW.
Just have your sister click on your link (when created) to sign up! Easy peasy!!! Hope this helps!