As no doubt you are already aware, your fathers aircraft is listed in our database here.
http://www.airport-data.com/aircraft/N4265A.html#
In terms of aircraft recognition, it is a Corben Baby Ace Model C, and is now listed as such in the profile but your fathers name is indelibly shown in the unique cn, construction number.
Further data is listed on the FAA website here.
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=4265A
You will see that it was de-registered in 2012.
Unfortunately the listing does not show the aircraft's previous history in full but you may wish to contact the last listed owner who may be able to help you further.
If you wish to find out more information about the aircraft type, I suggest you enter
Corben Bay Ace Wiki
into you computer search engine.
Malcolm Clarke
Admin.