often tenants call for lead if a kid tests high for lead when a blood test is done. 

Also research how much time you will spend with the paperwork, are they going to ask you to verify your blood type, its a joke but some lenders will bombard with never ending paperwork requests.

If you need some quick cash maybe sell some blood plasma! 

We have always said blood doesn’t matter.

You don't have to worry about your other customers or employees if someone with high blood pressure comes into your restaurant or store or lives in you apartment.  

Every first of the month all the blood in my body rushes to my head :)Am I still happy being a landlord?

I actully had to ask my 3rd tenant to find another palce to live beacuse the other 2 were leaving, and i wasnt able to find replacements.Also like others said, there are zoning laws on how many non-blood relatives can live together under the same roof. 

@Christopher Lim look at how much debt does tenant 1 have; and is the cosigner a blood relative?

It's a blood bath out there right now and you can't buy a house in that area unless you are offering all cash and waving contingencies. 

Not that they are all cold-blooded lizards, but its in their best interest to write offers that will get accepted.