Having seven children has changed the equity goalposts for Waikato farm owners and sharemilkers Colm and Gaynor Tierney. Sheryl Brown reports. Colm and Gaynor Tierney are standing at a crossroad asking themselves: is big always better? The couple own a 75-hectare farm at Ngaruawahia in the Waikato, which is currently run by a 50/50 sharemilker,...