Are there any sister paper immigrants in Canada?

Your question is a little tangled. Are you almost there? Does it explain what the problem is? What is the concept of sister immigration? I analyze your question like this: (1) One sister (or younger sister) is in Canada and the other is in China. Canada's sister (or younger sister) wants to reunite with China's sister (or younger sister) and come to Canada. Is that so?

If that's the case, I'll give you an accurate answer, no.

(2) If a couple has two underage sisters, they can immigrate to Canada, but the main applicants are the sisters' parents. Sisters can immigrate to Canada together as subsidiary applications.

(3) If a single father (or mother) applies for reunion immigration in Canada, a pair of minor children (sisters) can also immigrate to Canada with their father (or mother) as affiliated applicants.

So, what do you mean by sister paper?