The actor welcomed a new baby in August of this year – with two-year-old Henry losing his battle with cancer in January.
Speaking to The Sunday Times Magazine, 41-year-old Rob revealed that Henry was the first person that he and Leah told when they discovered that she was pregnant.
When asked if the decision to welcome a new addition into their family amid the tragic circumstances was easy, the star said: "We likely would've had a fourth anyway, but there are mixed feelings.
"It's sort of like they touch each other a little bit, but they almost exist in separate lanes.
"Having another child in no way, shape or form eases the grief of Henry dying.
"But also, having Henry dying doesn't make our new son any less magical.
"I want to gobble him up and he deserves our full attention and love – and he grew in the same womb as Henry."
Rob went on to reveal that Henry being diagnosed with a brain tumour in 2016 has left him "terrified" for his children's health – but he tries to keep his paranoia at bay for the sake of his children.
He said: "[I'm] terrified of anyone vomiting. It's like PTSD.
"If anyone vomits I think, 'Oh, that must be a brain tumour', and I have to calm down."
Rob previously detailed his son's cancer battle in a moving open letter, writing at the time: "A little over a year ago Henry vomited at his oldest brother’s fifth birthday party. No big deal — he was our third kid and we’d cleaned up enough gallons of puke not to be fazed.
"He was 11 months old at the time. The next day he vomited a couple more times so my wife called a nurse who said to bring him into A&E."
However, the tot wasn't diagnosed at the time and eventually the sickness appeared to wear off.
After Henry's first birthday, the vomiting "intensified" and he started to lose weight – with several visits to GPs and hospital proving fruitless in getting the baby a diagnosis.
Finally, Rob took him to a paediatrician who recommended Henry got an MRI scan and he was diagnosed with Ependymomas – he had a tumour on his posterior fossa in his brain.
Henry underwent several surgeries that left him with "Bell's palsy, a lazy left eye" and deaf in one ear – he also had a tracheotomy, which damaged the nerves that handle swallowing and gagging so badly that he had to have a tracheotomy tube inserted, which prevented him from speaking.
Sadly, Henry's tumour came back – and his family were told that he was going to die.
Rob shared: "I stopped writing when we saw the new, bad MRI.
"My wife and his brothers and I just wanted to be with him around the clock and make sure his final months were happy. And they were."
In February, the actor took to his Facebook page to break the news of Henry's passing to his fans – praising the NHS for all that they did during his son's cancer battle.
He concluded the heartrending post with: "I am desperately sad right now, but I can say with authority that there is good in this world.
"Thank you, beautiful Henry, for spending as much time with us as you did. We miss you so much."
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