每18个月只能停留12个月是必须的,你取消不取消签证,是否重新申请旅游签证都一样。
你要保证你父母再来的时候 要一直满足这个条件,
Ensure that you do not stay in Australia for more than 12 months in any 18 month period. Like all visitors, parents granted Visitor visas are expected to maintain extended periods of absence between visits to Australia. Your visa will be subject to condition 8558, which states that you must not stay in Australia for more than 12 months in any 18 month period. If you do not comply with this condition, your visa may be liable for cancellation.