Student loan quiery

My Mom got married 2 weeks ago but doesn't live with her partner yet. It's asking me for her partner's details on my student finance forms but he will not be financially supporting me this year. My brother also submitted the form before their wedding and now i'm worried i'll get less loan then him and less loan then I recieved in the previous years of my studies. Is there an option for me to fill out the form without my Moms partner filling out as he's not one of my sponsors and nothing from the previous years of my studies is changing as my household income hasn't changed so I dont see why I should get less loan now just because my Mom is married. I'm worried I won't be able to continue with my course as my Mom can't afford to financially support me and on the last 2 years i've been very dependant on getting the full loan. I also should'nt be getting less loan then my brother.