864A co-sponsor for friend's parents?

javaxmlsoapdev

Registered Users (C)
Friend of mine(who is US citizen) applied for immigrant visa for his parents(who are in India right now) but Mumbai consulate rejected application asking for co-sponsor as friend's income isn't sufficient. I am trying to help but wanted to find out/clarify a few things from you experts.

1)I am not a US citizen but hold Green card. can I be co-sponsor for his parents?
2)Though I am not a relative. can I still fill out 864A to support spondor?

Please advise.

Apologies for cross post, but wasn't sure which forum is more appropriate for this question.

Thanks,
 
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