I can't exactly have that either, because they require to see the income statement from the past 3 months. Even if they give me the money for this trip, the money they deem as sufficient should be seen from the last 3 months so it wouldn't count. So instead, I gave my family member's income statement because they have sufficient income to sponsor me
I have no idea why as well. They needed a proof of relationship to the sponsor and they are able to see the relationship through my birth certificate itself but I'm not sure why they require extra proof :/