Why is that my sister is more generous to my aunts cousin than her own family?

Anonymous
My sister never gives me a gift but she gives expensive gifts to my cousin, aunt and sometimes stranger. When those people dont help her when she needs them but I always help her. Even borrowing money for college she won't lend me and gets mas at me for asking for her help
Why is that my sister is more generous to my aunts cousin than her own family?
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