Getting parents to cosign a lease in a college town

[Ravi Rai]

Hi Guys,
We have agreed on a purchase price for a two family house in a college rental area and if the inspections goes well we will be buying our first investment property. I wanted to know if any of you have parents co-sign a lease (these are all college kids). The reason I ask this is when we were looking at properties one of the owners said she insists on parents also co-signing leases for their kids. I have not heard of this and wanted to know how you guys do it.