A LIGHT heart, laughter and understanding are the hallmarks of a great granny, 86-year-old Au Mak-kiu told candidates for the Model Grandparents Election 1996. Ms Au was the Victoria Junior Chamber's model granny gold award winner of 1992, and spent yesterday promoting this year's campaign - which culminates on Grandparents' Day in October, and opened for nominations yesterday. 'I think my high spirits and my warmth has made them like me,' she said. 'The most important thing is that I am never wordy. I joke with my children and grand-children and talk to them a lot, but I don't like to be long-winded.' The perfect granny has 31 grandchildren and great-grandchildren - plus five sons and four daughters.