First off, Tell your cousin congratulations for picking KU. Funny enough, I'm a member of the Sigma Nu House which was mentioned above. Everything he said is true, and if your cousin is interested in Sigma Nu specifically then pm me or something and I can definitely give you more info for him.
Here is a website with many helpful items on it.
http://www.kugreek.org/ifc_join.html
It has:
Summer Formal Recruitment Registration Sheet (in case he hasn't signed up yet, the link is on the right of the page)
The IFC recruitment guide (Which includes Bio's of all the houses and an overview of what Formal recruitment schedule is. This link is also on the right)
If there are any more questions let me know!