How can you deal with this situation in family matter problem?

here is the situation being a fourth elder in your family and ur all 8 kids and then your parents wont able to provided the needs or education for your siblings and as and elder sister your help them send them study take care some of thier needs and everything but then some of your siblings didnt study well but to drop thier study and just dont do nothing about thier self but giving more responsiblity to you like getting pregnant without a father and the brother making thier girlfriend pregnant and when they need something they always hands out and if you cant give them they well make you feel bad by saying bad stuff againts you , and saying when they do mistake say dont worry wont ask you help anyway but at the end they well run to you , of course by being older sis even thats your family you feel mad about that bec they saying stuff that they can even stand for and there is a point that u gonna say thats it but then u cant just look them bec they are your family need to help ,