And his brother Kevin is a Hollywood movie legend, having starred in such blockbuster movies as:
Home Alone
Home Alone 2: Lost In New York
Home Alone 4: Taking Back The House
...the list is ended!
"He gets kicked and elbowed but doesn't flinch" according to The Athletic - https://theathletic.co.uk/1476748/2019/12/24/he-gets-kicked-and-elbowed-but-doesnt-flinch-mac-allister-almost-ready-for-life-in-the-premier-league-with-brighton/