- 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.
- Brother-in-law of Elsa Pataky.
- Second cousin of Taylor Hemsworth.
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