Sorry about the delay in getting back to you. Your wife's stay on the Island was a bit before my time so don't have any info on him.
As you may have seen on this website, we have moved over to a Facebook Group Page, where you can post a message about her father and I am sure that someone will have some info about them from that era.
The Facebook group page can be found at https://www.facebook.com/groups/503265126402240/ - the name being Stonecutters Island, JSTS.
I have also sent you an email invite to the group as well as a direct email.
See you over on Facebook.