Immigrants will have to support their parents financially for a decade if they are approved to settle in New Zealand, under new rules the government has introduced to cut spending on immigration. It doubles the five-year sponsorship period adult children sign up to when they apply for their parents to join them. The increase is the latest in a series of policy settings that the government has changed because of concerns about immigrant numbers and costs. A freeze on the parent category began last month. Immigration New Zealand said the sponsorship period increase from five to ten years would affect those people who had already been invited to apply, and anyone who applied in the future. Immigration Minister Michael Woodhouse announced the freeze last month, saying immigrants' parents were seeking…