I-864 for both parents

[AS1965 1]

Hello everyone, please HELP

I got my both parents I-130 approvals. and now I have some questions about I-864.
I know I have to fill up 2 separate I-864 for my mom and my dad. and I know I shouldn't count my mom in my dad's I-864 and I don't count my dad in my mom's I-864. I was checking the 2014 poverty guidelines to see if our income( my husband and I ) is enough for both of them. and I think I have a problem to understand this forms.
my husband and I together made $34,648.00 for 2013 year and only $3000.00 in our saving account. and we are 3 person in household ( my husband and my 3 years old son and I ) than we are 3, with my mom and my dad, we will be 5 people. and for 5 person we have to make $34,887.00. how they count my family on I-864.
question 1- do I need to show income for 4 people in each I-864 or because I am applying for both my parents, they need to see the enough income for 5 people?
question 2- my 2012 and 2011 tax return are very low and we didn't make that much money, is that important to have enough income for last 3 years or last year income is the only year that will be count for them ?

question 3- my 2013=$34648.00 and 2012=$14000.00 and 2011=$16000.00, is that okay that I only make enough income for the last year and other 2 years is not even enough?
thank you so much

[Pitaya 2,577]

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