Hmmmm. My experience is, most families are a bit nuts if not moreso. That's my professional opinion!!!
You speak of boundary making and keeping as if it were simple--and maybe it is/has been for you, but for lots of us it's not! My family only learned to respect my boundaries after YEARS of my working at it. I come from an ordinary, run of the mill American somewhat addict/codependent strong-opinioned very attached/loving/domineering crowd. It took much repetition on my part, and really in the end just saying "I am not having this conversation with you anymore" and then refuse to discuss anything important to me again (UC, non vax/natural healing, homeschooling, etc). I had to say that to my mom several times, gradually escalating to hanging up on her, walking out on her, etc til I finally just shut that door entirely and forever. My sibs would rush to her rescue, calling me to complain about my disrespect and so forth, "but this is your MOM!" Right. But I am her daughter....doesn't that road go both ways? They actually often sided with her (so it wasn't just her beating on me about my various different choices) but they got it much sooner than mom/dad that I was doing what I was doing no matter what they said. They realized they were unable to manipulate me emotionally into doing as they did..and they let it go.
And gradually my kids got old enough without dying or being defective in any way, wow, actually being quite glowingly healthy and smart and well socialized and all-- so that they could see whatever nutsy behaviour I engaged in, apparently it was either working well or I'd been terribly lucky but in any case it was useless for them to argue against my success (even if it WAS accidental as they mostly preferred to believe for years. Now they realize I'm smart and daring and competent and so forth. Plus of course, they had no wish to drive me away--which apparently my mother could not fathom would ultimately happen if she did not give up her continuous struggle to 'correct' me (control me).
Anyway, it is late and I'm babbling, but I say again--for most of us, it is really not so simple to set boundaries with family and other close people.
In my opinion, the more you care about and are close to someone, the more you will want to know and respect their boundaries (and this will be mutual). In the opinion of The Average Bear as far as I can tell, 'closeness'--especially among fams--seems to mean allowing no boundaries whatsoever, barging in, insisting on continuous full disclosure and the right to argue and demean.
Maybe you were just really lucky with the family you got, to have gotten this far believing that it is a simple matter to give that full disclosure out of a wish to honor 'closeness', while still feeling that it is not hard to get your boundaries respected. Most of us just don't live in that world however.
As for a knack that might make me a good judge, er thanks. I think!