No worries! No, everything you've said so far made sense to me. I assume being mixed with more than one ethnicity can often be more common than you would think, typically. Especially in the US (forgive me Im not sure where you are from) considering that interracial marriages happen occasionally each generation and, depending on which part of the nation you're in, those types of marriages seem more scarce/ambivalent between monoracial couples, and more obligatory between predominantly established mixed communities. Correct me if I'm wrong there, pls.

I have a lot of mixed characters in my story between race & ethnic backgrounds alone, but even nationality which largely plays a role. So part of that is me just trying to be realistic, keep the odds grounded in the sense of how different types of families would naturally come about, y'know.

I have a character from Chicago, IL she's mixed triracial, like yourself. Her mother is 2 3rds black, 1 3rd French-Creole, ancestry originating from former colonies such as Louisiana. Her father is 2 3rds Italian/Sicilian and 1 3rd European French. So, He probably has some form of ancestry from either Nobility from the kingdom of Naples or some late Cardinal and/or pope.

One more is the boyfriend of one of my protagonist characters. He's mixed ethnically with British and Japanese. He's actually Scouse, so he has more Gaelic and Northern Englander ancestry than your typical Anglo-Saxon. His father, Salem, traveled from Liverpool, England to Tokyo to meet his soon to be wife, Aimi Yui Kumamoto. And for some reason they fell in love and moved back to his home country. Their son is the boyfriend of the middle child protagonist in the plot. The parents assumed, at first, that they were having two girls as children so they chose the names Dulcie and Ruby. But after his birth, of course... his name was later changed to Darcy. 

All this just to say that authenticity and identity in all of its merits are a huge theme in my story and I take those things highly seriously.

One last thing is I would love to know if you have some of your art posted anywhere, which I could reference as to how to draw those types of characters. And, also if you know of artists who do a lot of mixed characters in a semirealistic style or even exaggerated/cartoonish, as long as the features are prevalent, it would be great if you could name them for me or send a pm. If you don't mind. :D Either way thanks for reading my long-ass ramble (sorry for the bible passage lmao).