Son, 21, arrested after 'attacking parents with knife'

A 21-year-old man has been arrested at a home in Sydney's northwest after allegedly stabbing his father and wounding his mother during the night.

Paramedics were called to the Oatlands home just after 4am on Friday, where they found the 55-year-old man with numerous stab wounds and a 53-year-old woman with facial injuries, police said.

The shirtless 21-year-old was taken from the scene in handcuffs in the early hours of Friday morning. Photo: 7News

Photo: 7News

The father is in a serious but stable condition in Westmead Hospital while his wife is stable.

The shirtless 21-year-old was taken from the scene in handcuffs in the early hours of Friday morning.

The home in Oatlands. Photo: 7News

The father is in a serious but stable condition in Westmead Hospital while his wife is stable. Photo: 7News