He has two children, Wednesday and Goldie G Grint, with fellow actor Georgia Groome.
Grint's new film, Nightborn, sees him play a new dad and explores themes of parenthood and postpartum depression, which resonated with his personal experience.
He admitted that the first few months of fatherhood with his eldest daughter, Wednesday, born in May 2020, felt "isolating".
Grint cautioned Harry Potter fans that his character in Nightborn is a significant departure from Ron Weasley.
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