The 19-year-old singer offered to fork out the lump sum on a plush property in Canada for his dad, Jeremy, and his half-sister Jazmyn, five, and three-year-old half-brother Jaxson, because he wanted to make sure they had a nice home.
A source told TMZ: "Justin wants to make sure his half-brother and half-sister are living in a really nice home, so he shelled out a cool $850k in cash for a five-bedroom cabin-style pad in Ontario, where they live with their dad."
The stunning mansion is located out in the wilderness in the north American countryside in Ontario, which has a population of just 8 000 people.
However, the Beauty and a Beat hitmaker is keen for the neighbours to know his dad is living next door to them as he's plastered the family name across the postbox.
Meanwhile, Justin - who split from Selena Gomez earlier this year - reportedly spent a hefty $10 000 at a strip club in Houston, Texas, in just under 90 minutes while on a night out recently.
His mother, Pattie Mallette recently admitted she finds it "difficult" to let him make his own mistakes.
She said: "When your kids hit a certain age your parenting style changes and it is hard letting go."
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