I'm INFJ, mother's ENFJ, sister's ESTP - the same four functions, just ordered differently.
The ENFJ is too giving, too forgiving, too kind; people use her kindness, and when voices any people-related frustration she'll say things like "that probably sounds mean", and i'd reply "Not really, they'd deserve it." - Always tell me that I should "get out and socialize more", which I consider "going out of my way to meet people that I neither know nor care about.." to be "a complete waste of my time." She has this propensity to "do things the hard way", making things far more difficult than what they need to be, then complains about it. She's similar to the ESTP with money, but not nearly as bad; they both have the tendency to splurge money spur-of-the-moment-like.
I notice that I almsot always consider the future and the potential impact(s) of my actions before anything else factors in; before other people's well-being; before spending money, etc.
The biggest variable between the two of us that I can see, is that the ENFJ is too accommodating, too giving, too selfless. I think it's admirable, but foolish. I can be very giving and caring, but i'll know if someone is "deserving of my efforts" and i'll always make that distinction - the ENFJ will just help anyone and then complain to me about being used.
The ESTP is quite the opposite, she's far too selfish, spontaneous and has no grasp on the value of money. Those two clash a lot because it's a give-give-give/take-take-take relationship. I don't clash with either because i'm rather tolerant, but if they encroached on my personal space too often then i'd slowly begin to display external aggitation and frustration.