start with the new background first:
then open the picture of your brother-in-law:
simply drag & drop the layer of your brother-in-law onto the background picture and position him where you like:
select the "Magic Wand" tool and configure it like shown. Use the tool to click onto the background of the brother-in-law layer:
hit backspace to delete your selection:
you might want to do some cleanup along the edges, voila, not too bad for 2 minutes of your time!
Andy