Now, not all of this will be type-related either. Rather they are generalized observations of things I've found the three individuals have in common. Naturally, some non-pertinent or typologically generic info will cycle in not to mention the possibility of an incorrect typing here or there (I'm almost positive that they are all delta ST, though it may be that my uncle is ISTp). Anyway, take it all with a grain of salt:
The ones I've known tend to be pretty relaxing (noting that I only know them outside of a work environment, except for my uncle, who I've worked with on his farm). However, when things pop up that need doing they address it immediately and decisively, seemingly without it being a big disruption in terms of mindset. They all hold themselves and others to pretty high standards.
I've noticed that all of them has a sort of narrowly peculiar type of humor (either in content or form) as if it's more of a learned activity rather than a natural feature of their conversation. My uncle and my mother (whom I only have knowledge of by her accounts) are strict taskmasters, but so long as you work hard and attempt to carry out what's asked, they're quite genial. Otherwise, you decline in their eyes.
Character accounts for a lot in all of their views. If any of them see in you cause to doubt your trustworthiness or good will, reactions can range from confrontation to restricting all further contact to the necessities of the situation (strictly business, ignoring you, etc). On the other hand, if your good character is demonstrated in some way (it takes more convincing from some than others), they tend to open up and become very warm individuals.
Once you've earned their trust, it takes something significant to lose that, such as a moral breach (a betrayal, perceived or real). In contrast, they don't seem to deal with uncertainty particularly well regarding their personal contacts. Dissembling is detested (keep it real, folks) and direct and sincere communication is the bee's knees.
Hmm, that's all I can think of at the moment, and the more I think about it the less this sounds like a description of a particular type, much less a subtype of a particular type. Still, I have people in my life like this and I tend to get on very well with them. So there!