Hopefully they can get through this together.
Here's what he wrote in the letter:
[Image via WENN.]
It has not been a good week for this guy.
The Wanted star revealed the sad news happened on Wednesday. He posted a tribute picture of him and his grandpa on Instagram and wrote:
"R.I.P Grandad. Gonna miss you. Hope I can continue to make you proud."
We're sure that's going to happen without a doubt, but we hope Nathan is okay.
He probably already knows this, but he should definitely hit up his family or friends during this tumultuous period in his life.
Their support can make a world of difference!
Our condolences to him and his family for their loss.
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[Image via Instagram.]