Just to clarify here, your Man object has multiple Dogs, and each Dog object, has an integer property that has the number of bones, and you want to get this property, sum it up from all the Dog's for each Man, and display it using LINQ?

If you create a dummy console project and attach the source or put it on pastebin (http://pastebin.com/), I'll take a look and see what I can to do to help.