His uncle was bushman Rod Ansell, who inspired the film Crocodile Dundee (1986). Rod was married to Luke's aunt (Luke's mother's sister), Joanne van Os, who is an author.
Has four children with his wife, Samantha: Holly (born 2009), Ella (born 2010), Harper Rose (born 2012) and Alexandre (born 2013).
His maternal grandfather, Martin van Os, is a Dutch immigrant. The rest of Luke's ancestry is Irish, English, and smaller amounts of German and Scottish.