I live with both parents but my mom wants me to only put her income.

I most likely do qualify for excelsior. I’m not sure how much my dad makes but it’s less than my mom, and she makes about 40k. I have heard about the data retrieval tool but I’m not sure if they file jointly(I’m not that tax savvy, the only time I got taxes done my mom did it for me and didn’t give me the entire refund). My dad agrees with it unfortunately. I don’t think they understand it’s only going to cost me more in the long run if I lie. What do I do if they refuse to give me his info? I don’t want to lie and get extra money someone else could use.