My experience with Marans is that they are wee bit flighty and not particularly enamored of children. And too noisy for my situation. I think for young children a more docile breed is a better choice. Nice birds for older children and adults, though, if noise isn't a significant issue. (It often amazes me that a neighbor whose Rottweiler and Chihuahuas bark all night complains to Animal Control about hen chatter. Animal Control didn't find the hen too loud - but to keep peace in the neighborhood I wound up selling ours.)
I'll take a neighbor with a half dozen hens over one with a couple of yappy dogs any day!