Gary and his wife found out about their daughter's rare condition called anencephaly when Amie was just 11 weeks pregnant.
After welcoming Bella and Willow on 12 April, the proud parents 'soaked up every second' they could spend with Willow before she passed away.
In a heartbreaking Instagram post the following day, Gary said: 'Our beautiful baby girls have arrived.
'The most perfect little souls we have ever laid eyes on, we feel so truly blessed to be your parents.
'Amie, Bella and I soaked up every second we had with Willow, making as many lasting memories as we could all together.
'It's those little moments we know we will never get back, and we will forever cherish the time we spent as our little family of four, before our darling Willow grew her little angel wings.'
Sending love to the Rohan family again!