Parents and brothers/sisters are the most common family relationships that are generally qualifed for immigration benefits in addition to spouse and minor children. But different situations have different cases and brothers/sisters of a green card holder are not qualifying relationships for any immigration benefits as those of a US citizen do, for example.
So, if you have a specific immigration related question involving a parent or sibling, please provide us with all the detailed information so that we can assess the situation precisely to give you a better comment. You can email your quesitons to us at: