How outdated do you hold to be to comfort a relative apply for green card?

a family member of mine from a different country is trying to immigrate into the US, so i was wondering if you're 18, can you lend a hand them apply for a greencard?
Answers:   
No.
You need to be 21. And have money to support him/her while he/she get his green card.
Green card holders can only petition their spouse and children.
Only a US Citizen can ask for and immediate family member to be legalized. And they enjoy to be 21. uscis.gov.


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