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Applying for student finance, parent working abroad

Hey guys,

just wondering if anyone can help me with this.
My dad works oversea so I live with my mum(my dad is perfectly in love and still married with my mum). For the martial status of my mum the most suitable one seems like "separated" then... maybe because of that, afterwards in the parents detail part, I didn't get ask anything about my dad, but the main household income comes from my dad though... how do i put that into my form? do I need to? I try to convert what he earns into British pounds to get a rough estimate of our household income... but i am totally confused at the moment...what do i do?

thank you
(PS my whole family are British citizens)