would have
Looks like they are in a pickle and it's difficult to hesitate a guess on what will happen tommorrow (that might sound strange but when the disruption is this bad it's true)
looking at the flights I would say the GOA will go first as due out at 0030 tommorrow am then the SSH and your ACE go out tomorrow afternoon. The earliest they would be back is say plane leaves EMA 1430 into ACE 1830 1 hr turn 1930 back into EMA 2330 APROX TIMES.
However
The aircraft have to get back into EMA tonight then back out and come back tommorrow.
Weather permitting, crew permitting.
However, it depends on the state of the Thomson aircraft around the UK you could find your parents turn up tomorrow and get shipped to somewhere else and road it to EMA, or they might throw a spare aircraft into EMA and it goes on time.
Whatever happens your in good hands. If ACE has a departure board on it's web site keep an eye on it first
Good luck
