I loved talking to the Grubbs. I think most that like talking to characters know this, but if you talk to the princess grubb right after the big turning point then she says a lot of stuff that I think give some insight into "stranger 2". You can't talk to her at any other time in the game so make sure to talk to her then.
I'm not going to say what she says because this isn't the spoiler forum, but I'm going to make a post about it right after this.

Guys, TheLonelySteef is right: this is not the Spoiler Forum. Please watch what you say. You've (hopefully inadvertantly) given away several details about the game's ending which might spoil the experience for other people.