I brought my son back to China first. When his visitor visa( he had Canadian passport) was going to expire, my father and I went to 公证处 to 公证. We brought the papers to Police to apply for 寄养 visa for my son and had to renew the visa very year in Beijing but three years in Shenyang, it depends. It's not difficult at all. The reason for 寄养 can be: parents have to go to school in Canada...