look after, take care of

I look after my younger brother.

私は弟の面倒を見ます

I look after my younger brother attentively.

私は弟の面倒を細やかに見ます

I look after my little brother attentively.

私は幼い弟の面倒を細やかに見ます

I look after my little brother attentively at home.

私は家で幼い弟の面倒を細やかに見ます

I look after my little brother attentively at home after school.

私は、放課後に家で幼い弟の面倒を細やかに見ます