ENTJ dad
He and I are on the same wavelength pretty much all the time but his ENTJ characteristics are much more pronounced than mine are. He's more talkative, decisive, and insensitive than I am. He has his sentimental streaks at times, but he doesn't seem to know when blunt, direct advice or "toughening up" isn't the answer. Like me, however, he's more of a moderate and can see "the other side" of most issues. Conflicts don't arise between us very often, and we get along very well. I've seen myself grow into his example as I've gotten older.
ISFJ mom
We're.. not on the same wavelength at all, but that's okay. She gives step-by-step instructions for preparing a meal when I'd rather know something holistic about the entire process so I can see the connection between the steps, for example. Lives very much in the past, hates change, and seeks out like-minded company. She can get passive-aggressive and assume things, and I can see controlling tendencies in her. I love her tendency to want to help me, but I've got too much of an independent streak to let her do what she wants at times. We do conflict at times, but I always reassure her with an apology when I feel that I was wrong.
ENTJ half-brother
I think he's even more ENTJ than my dad, somehow. Our debates are all in good fun, but he accuses me of being a fence-sitter and indecisive, when I just view myself as a moderate who can see value in different positions. If I take any pro-Republican stance, he'll assume that I hold all of their positions too, for example. There's a huge generation gap between us so we don't talk too often (we both love a good intellectual discussion though), but I've got no qualms about our relationship.
ESFJ sister
Unlike my mother, she lets her emotions out rather than holding them in. She can be very, very friendly when she wants to be, or she can be angry and irrational. At least she realizes when her emotions are affecting her, and she can usually deal with them accordingly. I consider her to be one of my best friends.
ENTP brother-in-law (married to my sister)
Also another one of my best friends, I can relate to him pretty well. He's very relaxed and easygoing compared to the rest of us. Conflicts arise in their marriage when he doesn't plan ahead or when she doesn't think he's going to plan ahead. It's apparent that he's starting to "develop his J," though.