These were taken with a macro 100/F 2.8 lens. Had the opportuntiy to hang out with my Bro today. My Rebel XT with the "kit" lens needs some upgrading apparently! Enjoy.
I also have the Mark III with the 100mm 2.8, man it's great. Throw in a +2 or +2 diopter filter and it gets crazy. If he doesn't have one already make sure your brother buys a little $50 ring flash and it'll open up a new world in depth of field. Great pics.