The 42-year-old 'Hercules' star posted a snap of the wreckage on Instagram, reported TMZ online.
He captioned it with, "My mom & cousin were struck head on by a drunk driver this week - they lived. First reaction is to find the person who did this and do unrelenting harm to them.
"But then you realize the most important thing is my family lived through this and we can hug each other that much tighter these days. Hug your own family tighter today and be grateful you can tell them you love them," he added.
Dwayne's uncle said that Ata and Lina were driving home from an annual family fundraiser when the alleged drunk driver hit them.
Both women were rushed to the hospital and Ata was hospitalized for three nights for an injury the uncle refused to reveal.
Lina shared a collage of pictures on Instagram showing Dwayne visiting her in the hospital.
Lina underwent surgery for an undisclosed arm injury.