The father should remain on his daughter’s left side, as the bridegroom is supposed to be her "right hand man".
Traditional wording at a wedding is for the father to be asked: "Who gives this woman to be married to this man?
She is expected to travel in the car to the church with Meghan on her big day and was also present at the closing ceremony of last year's Invictus Games.
However, it was earlier reported that the Royal Family were not keen on having a woman fill the traditionally male role.
He said: "I hate the idea of missing one of the greatest moments in history and walking my daughter down the aisle." While Thomas Sr has since undergone heart surgery, which is said to have been "successful", Kensington Palace confirmed he will not be attending his daughter's nuptials over the weekend.