Hiring a photography Intern?

I am considering hiring a local student as an unpaid intern for help with shoots. My thoughts are that they would gain experience (and possibly school credit) while helping with carrying gear, holding reflectors and such. I am thinking of letting them take some photos to get the experience. After the photo shoot I would take my photos and their photos and place them on the website for viewing by the client. (The client would know that this is a photography student) I am thinking that I will give the intern a percentage of the profit if their pictures are chosen by the client.

My question is, I own the rights to my photos, and the client is signing off saying that I can post those photos on my website, but do I need the client to sign off for the intern as well or is it covered since it is my business and my intern? Also, when my intern leaves my company, they will be taking their photos, but what rights do they have to use these photos as a part of their portfolio?

Anyone have interns or students working for them that might be able to answer this?
** I live in California **
 
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