My family won’t stop bothering me for my little brother school fee and my dad works but won’t pay for him?

I’ll keep this as short as possible but my dad lives in London but immigrated to Pakistan as a kid and me and my little brother and sister are Americans and I used to help my grandma and dad with my sibling school fees and everything now I’m trying to go back to nursing school and I live with my partner we pay rent I work part time and don’t usually have a lot of cash on me so I told my grandma to tell my dad to help but he refuses mind u he married my childhood friend who’s my childhood best friends older sister always been abusive he’s a total scumbag he now has a daughter with her and told me to come to London but I refused so he didn’t talk to me since it’s a long story but in shorty grandma keeps forcing me to pay the fee she sends me receipts after I say I don’t mf have it and she says my dad will take him out of school if I don’t pay my sister who lives with her husband he pays for everything I kno she has the money but refuses to send it and she doesn’t talk to me either he’s abusive and I come from a broken family I don’t want my brother to not go to school my dad doesn’t care my brother clearly is on the spectrum not a lot but he won’t let him see a doctor and him and my sister claim they love him but don’t help him and my grandma acts like they are saints she gets rude not much but noticing it lately I don't know what to do anymore I just need an adults or anyone’s advice honestly thank u

My family won’t stop bothering me for my little brother school fee and my dad works but won’t pay for him?
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