At first l thought this a prison visit, but then with the tombstone reference, it became clear. I guess prison can be a little a like death, a person taken away for life.
Your annual visits, presumably on his birthday must be very special. I too have visited lost loved ones, spent time at their grave. It is at times like these that we feel close to them. We almost feel that they can hear us and see us. Perhaps they can? So we talk to them, tell them truths. Here your truth is written.