Welcome to the wonderful world of dog hair! As soon as mine lost her puppy coat, she has shed continually (more in spring and fall, but all year round there's some). She is not a boxer, but it seems to me that pretty much all dogs shed to some degree (except for those hairless ones, of course, but I personally would rather sweep up hair than have a smooth dog to pet). I sweep up enough hair to make a new dog every month or so, it seems.

I did see this phrase somewhere, though (I think on a coffee mug):
"Everything tastes better with dog hair in it"

Get a brush that the pup will tolerate and use it regularly. Also, there's been some conversation about higher quality foods being better for their coats and reducing shedding a bit (I don't recall which foods are better for this than others, nor how much shedding is reduced by, but maybe your brother can do a bit of research on that, since he knows his budget better than any of us do).