I'm not sure why my post from before didn't appear to actually post.
The page you're reffering to only means family such as spouses or children(don't quote me on the spouses part) So just write, "Not Applicable"
You will come to a form titled "Additional Family Information" this is where you will include all information about your mother, father, brothers and sisters.
Is your boyfriend not helping you at all with this stuff?? It would be much easier for him to read the guide and learn to fill out the forms!!
Good Luck!!