filing for brother + his family.. what docs required for his family members?

[skynar77]

hello,
i'm filing i-130 for my brother and his family. i understand that his family members can be included in the same petition, but am not sure about all the documents required of his wife and kids. does anyone know?
do i need to submit evidence of relation for his wife and kids? and, his marriage certificate?
what about passport copies and birth certificates of his wife and kids? are they required?

thanks in advance.