While true, in summer travel season more than half the plane will board early when SW allows families with small children to board between groups A and B. There

While true, in summer travel season more than half the plane will board early when SW allows families with small children to board between groups A and B. There's no real definition of small child and SW will let a party of 8 board early because one of them is 4 years old. Mom, Dad, teenage kids, grandma...etc. You really do need to pay for A boarding if you must sit together. Or game the system and claim you need to preboard.