In brief: no. Only one parent can hold a guardian visa to be in New Zealand with the children.
Details: https://www.immigration.govt.nz/opsmanual/#34312.htm
简单的说,父母只能有一方陪读,不能双方同时陪读,也不能两个孩子分别陪读。
详细规定请见以下链接:
中文翻译:http://www.admission.nz/ym/kmslaw/34312
英文链接:https://www.immigration.govt.nz/opsmanual/#34312.htm