I need a picture painted of my grandmother and grandfather who recently passed away due to cancer

I am looking for an artist to paint a realistic picture of my recently deceased grandmother and grandfather. The painting should be 16x20 inches in size. I'm open to all mediums, although I don't have a preferred one. My goal is to capture the special bond between them and to have something tangible to remember them by. I want it to look as true-to-life as possible so I'm hoping for a realistic style painting. I'm really looking forward to seeing what the painter can come up with.