The pair are also accused of tying a rope around the boy’s genitals, according to an affidavit filed by the Kaufman County Sheriff's Department.
The boy told investigators that his mum Christi Howell poured water over his head and nose, after her boyfriend Casey Shackleford, allegedly grabbed him by the hair, pinned him down and held a towel over his face.
According to KHOU.com an affidavit on the incident said: “The victim said that he was able to breathe slightly if he moved his head to the side and that kept him from feeling like he was drowning.”
The boy told authorities the torture he received came after he told Shackleford he had inappropriately touched the family dog.
The affidavit said: "The victim stated that he wanted to be honest and admit what he had done and that was why he told Casey.”
The victim then said Shackleford grabbed him and put him on the couch, and told him to explain what he had done before telling Howell to get a "pig rope" and tie it to his "private parts."
She apparently carried out the task and then "pulled on the rope as if she was trying to pull him around and off the couch.”
The rope was tied to the boys genitals for “five to ten minutes” according to the document.
Howell was arrested on February 9 and charged with injury to a child and her bond was set at $250,000.
The man turned himself in on Wednesday.
The child is now in foster care, according to a spokesman for the Texas Department of Family and Protective Services.