Do check your local/state rules on home butchering of livestock. Most places it seems you can butcher and sell from your house to individuals a small number of home raised poultry, but it's better to know that you're breaking the rule before you break the rule, I think.
Also - remember that salmonella is a concern for all poultry, and e coli a concern for all meat. Warn your neighbors to cook the birds right, and work through, in your head, what you're going to do if one of the family members gets bad sick and goes to the hospital and someone tries to blame it on the bird you sold them. I know, I know, not likely to happen, but neighbors can turn mean if a kid is in the hospital on dialysis and the doc says it was something they ate.