displaying the referrals made by a affilaite in tabular format

Dear Concerned,

We are using "invite" plugin to people to create blogs on our network.

I wish to create a list of invites sent and converted invites - and display them in a graphical format (attached format)

for example "blog A" refers "blog B" so we will create a list using datatables to display
who referred whom and if "blog B" subscribes and becomes a pro-site we will give a referral fee to "blog A".

I wish to know how and where the referral is stored in the wordpress database table so we could call those fields and make the necessary programming.

best regards.

srinivas peesapaty