I haven't got them to take an MBTI test, but curious as to any guesses (and they'll be guesses) as to what my family members types might be:
My mum is probably the most 'obvious', though I can't say for sure. She seems like a textbook ISFJ. Duty is what drives her life, and she says her main goal in life is to help people, fulfil her responsibility to care for people as a doctor. She was very caring of myself and my sisters, but in some ways not overly maternal. She said she knew from age 7 that she wanted to be a doctor, to help people. She's very fastidious, very observant (often notices things we miss), clean, organised, and conventional, doing things by the book. She's also big on presentation, looking neat, and all that, but wasn't that strict in terms of pushing me to perform well academically or anything.
In her younger days she was seen as a bit of a 'square', wasn't into having fun, but studying, reading the bible, attending bible studies, helping out.etc. She's not really mushy or touchy feely.
She's not especially creative, but enjoys reading and is very good at sketching things. She can be somewhat understanding, but sometimes has trouble seeing things from other's point of views, and can be dogmatic at times. She has a strong sense of right and wrong, and justice, and can be quite black and white about it (e.g. s he's interested in matters of social justice and feels strongly about it). Like when my sister went through a stage of lying she could only focus on how the lying hurt her, not the underlying causes. In terms of intellectual topics, if she doesn't see them as practical she doesn't have time for them. She sees having fun as a waste of time, and feels guilty for wasting time watching television or something, in her words. She's definitely more of an introvert: in fact outside work she seldom socialises (and sees it as a waste of time), and has said she could often have been a hermit or a nun. In social situations she is apt to give advice (playing the doctor) and doesn't really enjoy small talk.
Partly due to depression my mum can be negative, and if you suggest an idea to her she'll immediately shut it down. She's very practical, down to earth, and will immediately pick apart any idea she sees as impractical. She can be a bit of a nag, to be honest, but I know she means well, but she feels a strong sense of responsibility/duty for others.
As a parent she emphasises showing love through action: both herself and others, and while she does say things like I love you, isn't that big on words alone compared to my dad.
My dad is hard to figure out, but ESTP could fit him. In some ways he's a bit of a contradiction: independent minded and innovative, but also kind of conservative. I guess both of them being somewhat fundamentalist Christians (having converted later in life) has something to do with it. He's big into exercise, eating healthy.etc (well not as much before, but now), and keeps relatively active. He's sort of critical and judgemental, and has a very 'my way or the highway' approach to things, and likes to think he is often right. Sometimes he can be dogmatic about tradition and rules. While he espouses being tough and disciplinarian, he isn't always as strict as he makes out, and was pretty generous in giving us things, and letting us get away with things, unless we were naughty. He'd also make a lot of promises and was more into verbal and physical expressions of affection than my mum (which is also a family/cultural difference). Although harsh he tends to not hold grudges and forgive easily. He has a soft, sentimental side, too.
He's pretty bright in practical matters, and always sees opportunities, but wouldn't say he's that intellectual or a critical thinker, like he might often just take what he hears on the news at face value, and usually has an opinion on things. While conventional in some ways, he also does his own things, has a pretty distinctive appearance. Like me he's also very creative, having written a novel and been in a band (in his younger days), and composed a lot of music. He is pretty musically talented, I think. In conversation he can be scatter-brained, but is often the centre of attention, and seems more extraverted, though maybe moderately so. When he was younger he was a bit of a ring-leader, and claimed to have had many girlfriends lol. He said he was shy like me, but made an effort to overcome it. He has a lot of ideas - some of which he follows through with, and others (most of which) he just comes up with. Unlike my mother he's pretty disorganised, messy, forgetful.etc, much to my mother's chagrin.
He's pretty generous, can be pretty expressive, yet I sense an Fe-ness, same with my mother. Like to him rudeness, insensitivity, selfishness.etc are the cardinal sins. He often accuses my mother of being too sensitive, and doesn't like to talk about things. On one hand my dad is positive, yet on the other he can be habitually critical about things, which he perceives as constructive criticism. Sometimes he has a point, at others it's just a habit. At times he can be hypocritical (not to bash my dad), which has been a cause of argument between us. Actually while he does seem extraverted he can be quite introverted, so I'm not entirely sure.
I think both my mum and dad seem sensorish, and can take things quite personally. They are often about apparent things rather than the underlying concepts.etc.
Sorry if this post was long. I'll just do my parents first, I might ask them to take the test (if they will haha), but am curious if you can give any observations, guesses based on these very brief descriptions first.