questions about WIC.

i have an appointment tomorrow to sign up for WIC. i have medicaid so they told me over the phone that i already qualify. one thing i'm extremely confused about is the "number of people in your household" thing. so right now, we're living with my fiancé's parents. we're not paying rent or anything, we're just staying here until we can get a place of our own. which probably won't be for another 3-4 months from now. anyway, it's me, my fiancé, his mom, and his dad. 4 of us all together. (it'll be 5 next month when the baby is born). so what i want to know is what do we put for our household size? when they asked me over the phone how many people were in our house, i told them 4 all together. they asked how many of us are working, i told them just my fiancé. his mom gets disability/social security checks, his dad gets retirement checks. but we don't use any of their income, we buy our own groceries and living essentials. i'm not currently working and won't be until after i give birth. what i'm wondering, am i supposed to just say that there are 2 of us in the household? (my fiancé and i)? i've heard a lot of different things and been told to report just him and i, then others have told me to report just myself, and others have told me to report him and i and his parents. i'm super confused, just need a little advice.