for you getting a 100cc or hgher would be best a 125 2 stroke or a 150 4 stroke would be nice, and for your little pro an 80cc or 85cc would be a good choice. Any brand name bike will work hondas and yamahas and suzukis are great bikes but kawasakis and ktm make good smaller bikes for your brother. Dirt bikes don’t hold value so it’s easy to gt something a few years older that is relativly cheap, you can buy a 80cc from 1999-2002 for under $1000 and for 125’s the skies the limit on cheap ones.

You at 190 need at least a 100cc……your little bro could ride an 80cc……..i like Hondas put they all pretty much the same….why dont u want to ride off-road thats what they are made for??Hurts less to wreck on dirt than pavement