It is probably your Grandfather who is the old man in the park. Your Father probably pulled some strings to allow him to have 15 minutes with you. In the background you see a man, he is Marvin, Steph's partner at Homeland, after the conversation, you see Marvin putting him in the police security van.
As to the boat, I don't know what you mean? If you could explain more, I may be able to help.