Thomas, who has a rather distant relationship with his daughter and the rest of the royals, spoke to Daily Mail's The Mail on Sunday about his pregnant daughter and how he feels about becoming a grandfather.
The Duke of Sussex tested his skills on the children's driving course at the Invictus Sydney Jaguar Land Rover Driving Challenge following her Australia Tour.
Fraser Island's hardwood trees were used to build the London docks in the 1930s due to their famed toughness.
The Duke and Duchess are now enjoying a royal tour of Australia, New Zealand, Fiji, and Tonga.
Today, the pair will go to Queensland's Fraser Island, the world's largest sand island, before jetting off to Fiji, Tonga and New Zealand.
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Emily said: "Meghan told me that she's feeling pretty good so far, which is great, and that she's running on adrenaline. I wish her and Harry nothing but the best", he said.
"I hope it's a girl".
So, does Harry admitting that he'd prefer a baby girl imply that perhaps he already knows the sex?
The royal couple stopped to commend paramedic Graeme Cooper and transport officer Danielle Kellam, who brought a dying patient to see the water for the last time.
The royal couple have had a packed schedule from day 1 of their overseas visits, with 76 engagements on their itinerary over the 16-day tour.
Later on Friday the prince strapped on a harness and scaled the Sydney Harbour Bridge to hoist a flag of the Invictus Games, a sports championship for wounded military personnel.
"I think this is a new phase in every woman's life", she further added, "and I hope hers is as incredible as she wants it to be".