The actor shared the sad news on Facebook in a heart-wrenching post, revealing his son passed away last month.
In the social media post, he said: "I have very sad news. My two and a half year year old son Henry has passed away", he began.
Along with Delaney, Henry is survived by his older brothers, aged six and five, and his mother, Leah. According to the actor, in 2016 Henry was diagnosed with a brain tumor after his first birthday. Delaney further revealed that his son went through a surgery to remove the tumor early previous year and continued with treatments as well. Henry, who spent fifteen months in and out of hospitals during the course of his treatments, was left with significant physical disabilities.
The Delaney family was devastated, to say the least, which was heartfelt and obvious in the actor's penned announcement.
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"His tumour and surgery left him with significant physical disabilities, but he quickly learned sign language and developed his own method of getting from A to B shuffling on his handsome little bum". "His drive to live and to love and to connect was profound", the post read.
"I'm astonished by the love-in-action displayed by Henry's mom and his brothers", he added.
Rob, who is from MA but now lives in London, thanked the NHS nurses and doctors, as well as the charity workers and home care people that helped them during the hard illness, saying they "will be my heroes until the day I die".
'I don't want to miss out on their lovely lives.
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"They are why I will endeavor not to go mad with grief", he said.
And he ended his tribute with a message to his adored son. "I'm greedy for more experiences with them", he said.
"Thank you, lovely Henry, for spending as much time with us as you did".
As much as he was in distress of the grievous event, Delaney said that he would remain strong for the rest of the family, who had shown extraordinary love during the times of trial.
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The boy's grandmother, Michelle Lott, said she was pleased with Morris' reaction. "I wanted him out of the store, my son". After the spanking, Morris said Martinez told him, "That's how we do it in Mexico". "I was blown away by the situation".