Hi Barry,
I know that it's handy to be able to share items with nearby people, and AirDrop is certainly an easy way to do so. I'll be happy to provide you with some resources to help you out with this.
Note that when you're selecting which contacts to share with, this is simply turning on AirDrop and adjusting the setting. To actually share something to nearby contacts, check out our article here:
How to use AirDrop with your iPhone, iPad, or iPod touch
This should get you on track to sharing stuff with your brother again.
Have a great day, cheers!