parents financial info

When applying for student finance, I've filled out all of my bits and am now just having to sort out my parents parts. But on one of the first few questions for my parents, it asks what our household income is and after selecting our answer, it says that its unlikely i'll get a lot of money from the maintenance loan (which i expected anyway), however it then asks if my parents want to submit their financial information to see if I'm allowed any additional money, or if they don't want to submit their financial info then i'm still entitled to up to just over £5,000. but even if i press no, won't my parents still have to put in their financial information in to see how much of the "up to £5,000" i'll actually be getting?

So is that basic loan the one of £3,821?
I do have 2 sisters but theyre both moved out/married so i dont know if that still counts? My parents dont mind filling out their financial info, but i know my household income is quite high and i wouldnt want them wasting their time for nothing! But i guess its just better to input the income anyway
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