A basenji is a big dog in a small, fabulous body. They want to be treated respectfully, and they will respect you in turn. But they do need a firm, kind and loving leader.
When people ask me about kids and basenjis, I usually ask, "If the kid is chasing the dog or hurting an ear, and the dog gives a corrective nip–no blood or puncture, just a 'leave me alone' nip, do you consider that a bite?" If they say, yes of course and I could not tolerate that, I tell them that most basenjis would not be right for you. They are 'fair' and may give a grrr or nip to another basenji or to the kid, if cornered or frustrated. But attack for no reason and chew their face...never heard of such with a basenji. Many years ago a basenji of mine appeared to bite my grandson, my son used great restraint and didn't drop-kick my dog, and when we looked at the child, there was not a mark to be seen. But we saw the strike and the child screamed. The dog just had excellent mouth control and did a "could have had you, now behave" move. And the 2 year old child DID respect all the dogs after that.
My Nicky was evidently raised with kids, she loves them...for their toys and for low-held food. My friend Ginny was raised with basenjis and raised her 2 boys with basenjis in the house, but she is a "what did you do to the dog?" person. And her sons always put away their shoes and toys if they wanted to use them again!
Basenjis are perpetual toddlers, so I would not consider getting one, even a nice mellow adult, till your boy is 7 or 8, old enough to participate in care and training, and to really understand mutual respect.
They are my favorite breed, obviously, but they are not usually a 'lay on me, beat on me, pull my ears' dog !