Great Sitcom Idea

I really don't think this can fail, Han and I came up with it last night. It's sort of a cross between Perfect Strangers and Full House Anyway, here's a summary for the pilot:

A man decides to buy his partner an engagement ring over the internet. A couple days later, when he was expecting the ring in the mail, there's a knock at the door. Instead of a ring delivery, it's a child worker from the diamond mines in Africa! Somehow he bought an HIV+ mine worker by mistake! Hijinx ensue!