Siempre intenta subirse a la chepa de su hermano para que le haga los deberes.

[morbrorper]

English Translation

He always tries to take advantage of his brother to make him do his homework.

Wiktionary has another meaning for this expression:

subirse a la chepa de alguien
to disrespect someone
Synonym: subirse a las barbas

https://en.m.wiktionary.org/wiki/subirse_a_la_chepa#Spanish