Help :( PLEASE REPOND FAST

So my cat pretty much stays in my room all day (litter box, food, water, cat tree, nice window to look out) until I get home then I let him out. Then at night I put him in my room Bc my dad doesn’t want him setting off the alarm. My dad wants me to get rid of him Bc he meows at night and I tell him he wants to get out but he says no Bc my sister leaves her door open + the alarm. We were thinking of making a room downstairs but my dad was like that’s a lot of work. What should I do :(