Hi Amanda,
It would be helpful if you could supply some dates on your grandfather Ervin Mervin Corrin..... When & where was he born, when & where did he die, who did he marry & when & where, surely your parents can give some of these datails.

Did Ervin emigrate from IOM, If so, where too,when, etc Can you find out if Ervin had any siblings,and so on.

There are several people researching the name Corrin but some more details from you would assist them in making a possible link to your grandfather.

I hope this helps and good luck in making contact with other Corrin family

Kind regards
Elizabeth, Australia