I think my Mum is an ISFJ. I'm not sure though. Even though she is incredibly warm and outgoing with her friends over the phone and suggesting they go out, she spends a significant amount of time at home when she isn't working and would prefer to watch TV and listen to music most of the time. She seems most comfortable in her home environment and prefers that.
Though, the complete lack of understanding between me and her was really painful growing up. She was completely clueless as to how to really raise me emotionally I suppose. I still have a lot of resentment for that.