Two gardai lifted a teenager out of his bed and smacked his head against its frame after hitting him with batons, a court has heard.
Owen Gaffney claimed he pleaded with officers not to beat him in front of his mother, who was allegedly held up by her throat before being locked in a bathroom.
Gardai Alan Conlon, 29, Claire Delaney, 25, Eoin Murtagh, 30, and Sean O'Leary, 34, are on trial accused of assault causing harm to Mr Gaffney, forcible entry and trespass at the family home in south inner city Dublin on February 17 2008.
Conlon, Delaney and Murtagh are also accused of the false imprisonment of Mr Gaffney's mother Fidelma in a bathroom of her Basin Street flat.
They all deny the charges.
Mr Gaffney, 21, told the court he was asleep in bed on the Sunday evening after playing football when he sensed someone around him.
"I opened my eyes and Garda Sean O'Leary was standing to the left of me and he had two batons in his hand and he hit me there to the head," he said.
"I was dazed then and they all just started hitting me."
Mr Gaffney, who was 18 at the time, claimed Murtagh also hit him with a baton before the pair picked him up and smacked his head off the bed post.
"Me ma came running into the room when she heard them hitting me," he continued.