Okay my curiosity was peaked re the timeline so I looked back.
Meghan and Harry start dating 2017 (maybe 2016)
Annouce engagement Nov 2017
At this point Harry has not met her Dad (although I believe from Spare he had talked to him on the phone to ‘ask permission’ to marry her)
December 2017 - the paps track him down and photo him buying beer and cigarettes in a shop. He’s asked how he feels about the wedding - says he’s thrilled but can’t say anymore.
Harry still not met his future father in law
March 2018 Thomas is approached by a pap agency to take some ‘image enhancing photos of him preparing for the wedding’ encouraged by his daughter Samantha he does the shoot.
April 2018 These ‘candid’ photos are ‘leaked’ to the press.
Harry has still not met his future father in law.
At this point according to Harry and Meghan they send security people to help him with his pap problem and are frustrated that he doesn’t want to engage with the security people. (This is where I would have flown over with a ticket and brought my Dad /father in law to the UK)
May 4th 2018 - Kensington Palace issue press release saying both Meghan’s parents will be attending and playing a part in the wedding - they confirm Thomas will be walking her down the aisle.
May 13th - six days before the wedding - the TMZ/Mail on Sunday get exclusive scoop that the pap photos of Thomas getting ready were actually arranged with his consent and payment.
Harry still has not met his future father in law.
There’s then a confusing couple of days where Thomas releases a statement saying he’s not coming, then he says he is, then he says he can’t come because he has had a heart attack.
So just days before the wedding the plan is adjusted to have Doris ride in the wedding car and Meghan do a half alone, half with Charles aisle walk.
Edited to add - to this date Harry has never met his father in law.