Lori, a 38-year-old mother of one explained: "He doesn't plan on not going [to the wedding]. Out of respect, Tom says little – but I can't imagine him not being invited. He'd love to walk her down the aisle."
READ MORE: • Meghan Markle's father "extremely hurt" by Prince Harry's claims
Ms Davis added: "He stays to himself, but is very friendly."
She also refuted claims that Thomas's limp would prevent him from walking his daughter down the aisle - insisting it is little more than a "slight limp".
It comes after the Mail on Sunday spoke to a friend of Thomas about the wedding, who said: 'He's very excited about it.
"He's very close to her [Meghan] and he's very happy. All the pressure has been hard on him and he's just trying to stay out of the limelight."
Former lighting director Thomas, 73, is believed to have moved to his seafront bungalow in Rosarito, Mexico in 2016 after going bankrupt and lives a reclusive existence.
He previously called Harry and Meghan "a very good match," saying: "It's wonderful. I'm very happy for them."
Pictures taken last summer confirmed Harry had forged a close relationship with Meghan's mother, yoga teacher Doria Ragland; the pair were spotted deep in conversation while watching the Invictus Games closing ceremony in Toronto.
Doria and Thomas tied the knot in Los Angeles in 1979 before splitting when Meghan was six years old.
The former actress is set to marry Harry, 33, at St. George's Chapel, Windsor, in May.
MailOnline has contacted Kensington Palace for comment.