The star, 42, who is very close to his mum Ata Johnson, shared a photo of the wreck on Instagram on Sunday, accompanied by an emotional message.
CLICK ON PHOTOS FOR GALLERY
Dwayne Johnson is very close to his mum Ata Johnson
"My mom & cousin… were struck head on by a drunk driver this week – they lived," he wrote on the post. "First reaction is to find the person who did this and do unrelenting harm to them.
"But then you realise the most important thing is my family lived thru this and we can hug each other that much tighter these days," the actor added. "Hug your own family tighter today and be grateful you can tell them you love them."
Dwayne Johnson shared this photo of the scene of the accident
He signed off the message, "#BearHugsAndGratitude. #100PercentPreventable. #ChoicesMatter."
Just last week, Dwayne's cousin Savelina 'Lina' Fanene – a WWE Diva – shared an Instagram photo alongside his mother in the car.
Lina Fanene shared this photo of herself and Ata last week
She has since posted a picture of The Rock visiting her in hospital.