Almost every companion will initiate dialogue with him. Preston will ask for a cold drink, Cait for "what's under the table", Deacon for Moonshine, Strong for water, Danse for a non-alcoholic beverage, and Curie for a tour guide or a pamphlet.
Joe will sometimes refer to the Sole Survivor as "he" even if the Sole Survivor is female (most likely an oversight on the developer's part).
ps4xboxone When first meeting him, he's talking to his son about the Railroad, and involves the player. Choosing the dialogue option "Saving Synths sounds noble" will cause Hate from Nick Valentine if he is with you.[verified]