That good news, Dennis - and you are likely to find, in the long run, that the older boy will teach the pups far more than you ever can. They'll get their street cred from him !
I remember when I was a child there were two Great Danes at a store we used to frequent in summer. They were very patient with children, even the ones that tried to ride on their backs! I am sure a Basenji pup is less objectionable than a toddler. :)
Well I will tell you a couple of differences - walking basenjis you typically have 1 boy one girl - and stay away from other dogs. I can walk 2 or 3 bigs and 1 little and they just walk along - not as dog aggressive as some basenjis can be - still as food aggressive. Similar play styles - butt up. Since the basenjis at my house a Seniors - once the bigs get BIG I don't usually let them play together because a 2 year old big anything and a 10 or 15 year old anything not a good combination.
The hardest thing to get used to was - they bark. They are VERY attentive to everything outside of the yard when they are out and need to alert me.
A 57 lb dog in your lap is heavier than a 20 lb dog and takes up more space. Like basenjis I have some that are on your lap, some right next to you and some within arms length in case you drop something.
Like basenjis - they are a female led group BUT they don't seem to have to have that continuous discussion with each other on who is in charge.