長子
The eldest child looks after them.
長子が世話します
The eldest child looks after the younger siblings.
長子が弟や妹たちの世話をします
The eldest child looks after the younger siblings at home.
長子が家で弟や妹たちの世話をします
The eldest child looks after the younger siblings at home after school.
長子が放課後に家で弟や妹たちの世話をします
The eldest child looks after the younger siblings at home with their grandmother after school.
長子が祖母と放課後に家で弟や妹たちの世話をします