i-864 affidavit of support

Hi guys,

I am filling i-485 for my wife and my parents. 3 people. (but will sent out my wife first, then fill my parents)

alone with the i-485 I need i-864 affidavit of support, Do i need to fill all 3 people on one form or, I should fill my wife only first with your i-485, since I will sent her file individually then my aprents)

Thank You guys in advance