Brownsville police arrested John David Rios after he allegedly urinated on his stepbrother as he was asleep.
The incident happened on the 1500 block of Calle Espacio.
Authorities told Action 4 News that the 17-year-old urinated on the 13-year-old victim as he slept.
The mother of the victim called police.
As they arrived, the father was asleep at the residence.
Police said that Rios admitted to the incident and was taken into custody.
A bond of $7,500 was set for the 17-year-old.