By Tessa Oh Last month, a Singapore judge ordered a father to pay part of his 22-year-old son’s education overseas. The ruling has cast the spotlight on a little-known law that allows people above the age of 21 to sue their parents for education-related expenses. What happened in the case? A Family Court judge ordered the father to pay 60 per cent of his son’s study expenses in Canada. The young man’s parents divorced when he was eight years old. The father, a businessman, has remarried and…