I’m about to apply for a job and seen that I have a personal connection to the manager/interviewer, (they are the best friend of my late father who they also worked along side my father died many years ago and we have lost contact with this person) would you make a subtle hint to this connection in your covering letter? As to them it may not be obvious at first due to my married name they would not no or would you leave it in the hope you would be invited to an interview.