The only other person in the family whose extensive and investigated test results I know is the last on this list.
But for fun, and in spite of my inexperience, I'll try my best guess for my immediate family according to the functions they seem to rely on (maybe I'll revisit this post some time after I've internalised a fuller understanding of MBTI and laugh at myself):
Parent: ISTJ - an awkward stick-in-the-mud, will consult own feelings to make judgements but has no perception of others' feelings and values; great at maths, science, engineering type thinking but doesn't understand people/emotions/left-brain stuff (this strikes me as preferring Fi and Ni to Fe and Ne); insensitive, stubborn, has to have things done own way, always sure of knowing best; basically all the worst qualities of an ISTJ with few of the good ones (I've dated an ISTJ, I know how lovely they can be)
Parent: ISFJ - caring almost to the point of being a busybody (must be strongly Fe); the kind of person who gossips not out of malice but because of caring about what other people do and why they do it; very organised and responsible when it comes to achieving things based on values; I'd almost think ESFJ except for being quite low-energy socially, happy to be alone a lot; always comparing what's going on to own reference pool of prior experiences (I'm figuring that's quite Si)
Half-sibling: ESFP - positively anti-bookish, but very kinetically intelligent, active, and energetic; highly expresses through appearance and personal style; active, always taking charge, doing things independently and assertively; bold, brave, has stepped out and tried things a lot of people would be too timid to (strikes me as very Se); loves performing, especially bodily performing like dance; showy, loves attention; social life seems to be key to emotional life (outward warmth and friendliness seems more like a Se performance than intimate expression of feeling)
Me: INTJ - I'm just an overthinking introspective analytical little cold-hearted critic is what I am; am I really the only intuitive in this family though? Maybe I missed something...
Sibling: ESTJ - I'm pretty sure prefers Fi over Fe in a similar way to the above ISTJ; very practical and concerned with doing things the right way (own way) and rarely admits fault; strong-willed, outspoken, particularly tactless (often downright mean) around family; responsible, rule-following, cautious; doesn't visually express or respond to emotions strongly; my main clue as to intro/extroversion is that in spite of being closed-mouthed, this person is really active, keeps a lot of social engagements, enjoys performing for large crowds, and seems particularly comfortable in these situations
Sibling: ISFP - very sensitive in the sense of tactile, seems to have no filter for Se; seems to feel things very deeply and personally (especially fits the way Fi manifests in childhood); very quiet and internal; kinda passive, tends to "live and let live;" seems to have a hard time expressing self although I get the sense there are just worlds and worlds inside wanting to find expression; so emotionally reserved I probably couldn't have pegged for sure as a Feeler, but having confirmed it from the source it makes a lot of sense