I-130 for sibling

I am a US citizen and will petition for my sister and her family to immigrate to US. I know the requirements about I-130 and supporting documents from USCIS website. But I did not find anything about documents to prove my sister's relationship with her hu*****and and child.
Should I petition separately for each member in my sister's family?
What should I provide to prove my sister's relationship with her hu*****and and child?
Is it generally recommended to hire a lawyer for this kind of case and which lawyer do you recommend in southern California?
Thanks.

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回複:I-130 for sibling -7065- 給 7065 發送悄悄話 (268 bytes) () 10/17/2005 postreply 13:22:54

You are right regarding he -65173- 給 65173 發送悄悄話 (356 bytes) () 10/17/2005 postreply 19:02:36

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