What is the test for classifying a family as a social group?

In Casetellanos v. Canada (Solicitor General), 1994 CanLII 3546 (FC), [1995] 2 F.C. 190, Nadon J. stated: The characterization of the family as a social group goes to the persecution that is directly suffered by a person simply because he is a member of a certain family.... One will not, for example, be deemed to be a Convention refugee just because one has a relative who is being persecuted. There has to be a clear nexus between the persecution that is being levelled against one of the family members and that which is taking place against the others: vide Al-Busaidy v. Canada (Minister of Employment and Immigration) (1992), 16 Imm. L.R. (2d) 119 (F.C.A.). The family can only be considered to be a social group in cases where there is evidence that the persecution is taking place against the family members as a social group. For example, it is possible that a claimant may be persecuted for his own political views, and not because of those of his parents, who may also be dissidents.