Hope someone can explain me some on this.
Is that true, other family members can be added on to the GC list if the applier's GC got approved first?
-Yes for the non-immediate relative such as bothers/sisters.
My brother-in-law's sister applied GC for him back to 2000, with only he himself on the file so far.
I though the applications should have my sister's anme and their kid, however he was told this is not necessary, because they could be added in after my brither-in-law gets his GC?
-They had better be added into the application now so that the whole family can get the immigration visa at the same time.