what specific breed might be a better option
for a family with children, small flock that can’t free range, and is docile in order to mix with my bantams?
Wow! Lots of opinions on here re: different breeds as well as Orps. Every one has a story about their experiences. I have had different breeds over 13 years and liked most of them for different reasons -- some had good temperaments in the flock, a couple were bullies and re-homed away from our bantam Silkies, some breeds were good layers, others of the same breed not so good layers -- we don't regret the experiences as we learned from them all.
In mixing large breeds with Silkies we decided never to do that again to our Silkies. Silkies are mostly docile birds and larger chickens take advantage of that and can persecute the littles. Although our one remaining old Dominique hen is kind to our Silkies she will peck at them for food so we have to watch treat time to make sure she behaves. She knows we're watching her and she learned to wait her turn when we hand out treats.
Every bird has a different personality, every bird has their own laying style, every bird has either good or poor health issues -- on and on it goes. As for us, we've had birds from private breeders, local feed stores, and hatcheries and we've had good and bad birds from all sources.
We started out with two pet Silkies hatched by a home-school mom 13 years ago, we've cycled through 26 birds and different breeds in that time (Silkies, White Leghorn, Buff Leghorns, Blue Wheaten Ameraucanas, Blue Bredas, Cuckoo Breda, Cuckoo Marans, and Dominiques) and now in our senior years through attrition we're back to just Silkies again plus one old Dominique who has a forever home since she's good with the littles.
The White Leghorn was the best layer, Buff Leghorns not so much, Cuckoo Marans eggs were never the chocolate color you see in photos plus only a couple eggs per week, Ameraucana laid large pretty pale blue eggs but the hen only lived 3 years, the Dominiques and Bredas laid medium-size eggs about the same size as our Silkies -- so no brainer for us, we went back to all Silkies again since Silkie eggs are a good size for a larger bantam breed:
Silkies are fairly easy to handle, gentler temperaments compared to medium or larger breeds, won't fly over the backyard fence or fly out of the run, and they have no seasonal laying patterns. Our Silkies lay eggs, go broody, lay eggs, go broody -- year round so we're never without eggs. Each Silkie hen may not lay many eggs a year but with 1/2 a dozen Silkies we've never been a season without eggs in our skelter.
My suggestion is not to mix a heavy breed bird with Silkies. A 2-1/2 lb Silkie is at the mercy of a 7 or 8-lb Orp or Bielifelder. I mean, if our 5-1/2 lb Dominique was not good with our littles, we would've re-homed her but she has been behaving in her old age.
If you want Orps or any other large/heavy breed that you desire, I say go for your heart's desire! I just wouldn't keep them with Silkies like we did and learned the hard way not to do that again. In large mixed flocks a greater number of Silkies will go off by themselves away from larger breeds. But if there are only 2 or 3 Silkies in a big mixed breed flock of birds the littles will get picked on.
Let us know how it works out for you. If you have pics we would enjoy them!