Mark, you already do good work by post interesting blogs; now you also stand up as a speaksmen for STEEMIT.
We all try to spread information and indeed in many cases it is hard to explain (not a matter of convince) how it works, but when they get it, they are immdiately enthousiastic and would like to be involved into the crypto's. And when it is on STEEMIT, we did a very good job. Lets build the community even much bigger.
Your question how to help your brother to have some ROI.
I would suggest, because it will sure bring joy and fun; take the family for a day out to a nice park (Efteling); and make it a special momnt and share good memories together. When the children have fun in a ride; you have time to have a chat about crypto in your(s) life.