do you have good brother or sister?

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my eldest brother is a good man, a good husband and a good father. my youngest brother is shy but he is a good brother too. my sister is the one whom what we call our blacksheep eversince, she gave a lot of headaches to my mother and father, but still she's my mother's favorite. she's now working with a high paying job, and still single. she just use her salary for herself, but still she runs out of money and always bother my parents or either me in borrowing money. i hate this thing because she's not responsible enough about financial matter, i want her to help my parents financially. what should i do and what would i tell her to make things right for her.?