That’s funny you should say that about the barnevelders. Last spring I got some and they ended up all being roosters. Mine ended up being the flightier chickens I’ve seen. Maybe it’s because they were still young but they were twice the size of my hens and yet ran away from them. I handled them a lot as chicks and they still were scared of me. They ran even when I threw them treats. What did the mix look like?My crossing of these with pure Barnevelder has produced some interesting chicks.
I have only had the hens. All of mine are curious and eat grass from our hands but I do have a few that are flighty (which could startle/scare a child). None are aggressive towards us but they surely won't let you walk up and take eggs out from under them. I have found the SG's to be more active and a little bit more flighty than my Barnevelders. You may want to consider a true pure breed so you can be a bit more certain of what you will get. As a not yet finished breed this type has a large variety of behaviors in it.
It kinda depends too if you want a 'pet' chicken for your child to handle or just birds they can throw scratch to. Mine get pushy when they think you have something they want (grass, treats, scratch) and don't have a problem jumping up to grab it out of my hands whether I am ready or not.lol