Do i have to use my wife as an affidavit of support are can i use someone else like a family friend

Assuming your wife is the person petitioning for your green card, she must file an affidavit of support regardless of her income and assets. If your wife's income and/or assets are not sufficient to meet the affidavit of support requirements, you may use a joint sponsor. This can be a friend or family member. The joint sponsor must be over 18, be a citizen or green card holder, and have sufficient income or/and assets.