I believe that your great grandfather may have been the brother of my great grandfather Michael Jakich (Mile Djekic in Croation). Michael was born in Gracic in 1891 and had a brother that was approximately 3 years older than he. Unfortunately, we have not information on him but believe that he may have been your great-grandfather.
Michael married Anna Novacich who is also a Croation and married and had 5 children-Louis, Katherine, John, Michael, and William.