When I first spotted them last June, there were nine newly-hatched poults with the mother. She was cautious and I rarely saw them until later in the summer when there were two hens with a combined flock of twelve chicks. When the chicks were all mature, I couldn't tell the mothers from the rest anymore. By early fall, there was only a total of ten in the flock--two hens and eight young.
In late November another undersized hen suddenly appeared, apparently from another flock. This increased their total to eleven. She had an injured leg and always trailed behind the rest as they moved around the neighborhood. Happily, she recovered and walks fine but she's still smaller than the rest of them. It seems that while she's tolerated, she is not fully integrated into the flock.
When I consider all the chicks that went missing over the summer, it seems likely that all of the resident turkeys lost siblings or chicks to hawks and other predators. Their instincts tell them to beware of hawks and that fear kicks in whenever a hawk appears. It will stand them in good stead when they start their own families in the spring.