Confused with FAFSA household size??

<p>I am the first one going to college and I live with my parents.
I also have 2 younger siblings, one is 14 and the other is 3.
So where it says:</p>

<p>Your parents' other children if:
a) Your parents will provide more than half of their support from July 1, 2013 through June 30, 2014 or
b) These children can answer "No" to every Dependency Status question on the FAFSA</p>

<p>Does this mean our household size would be 5?? What does it mean by "support" for the other children? Support in general, or just financial support for college....?
I originally put 5 but now I'm just confused??</p>

<p>Yes, your household size is five. Three kiddos and two parents.</p>