My cousin's child would be my first cousin once removed, and I would be the same to them, but according to the same link:

The appropriate name for addressing your cousin’s child is niece or nephew, even though they are actually first cousins once removed.

If that's the case, is it also common practice for them to call me aunt/uncle even though it's not technically correct?

  • What do you mean “not technically correct”? Vocative kinship titles are honorifics; they are signs of respect. In cultures where a child does not directly address an elder by that elder’s first name, it is perfectly correct to prefix that name with an honorific like aunt or uncle as a form a respect.
    – tchrist
    May 22 '17 at 13:37

Yes, in General American English, the descriptive label for the grandchildren of your great-grandparent that are not your parents or aunts/uncles (or children of one's cousin) is 'first cousin once removed'.

But how you address them is really not settled or commonly agreed upon in the US. It all depends on your family's patterns, how close you all are, etc.

Using 'uncle so-and-so' or 'aunt so-and-so' for such a person would be similar to calling any friend or person in one's parent's generation the same, that is, some people do it, some don't. Also, this kind of calling is probably only for children – as they get older, they'll probably call them by their first name. (Of course, the older generation will probably only use the younger person's first name in any case.)

So feel free to use it if all parties are comfortable with it, but I would say it is not terribly common but that could be because the incidence of knowing well one's first cousin once removed isn't that common.

  • 1
    For the record, both your parent’s first cousin and your first cousin’s child are equally considered your first cousin once removed. Also, you ahve some tyops you mihgt want to fxi.
    – tchrist
    May 22 '17 at 13:34
  • @tchrist which typos? I am blind to them. Please edit.
    – Mitch
    May 22 '17 at 13:47
  • This matches my experience in the UK too.
    – AndyT
    May 22 '17 at 13:49
  • @tchrist re your first comment, the OP made that clear in the first line.
    – Mitch
    May 22 '17 at 13:54
  • 1
    This seems about right. I do spend time with a lot of my 1st-once-removed cousins, in both directions; in my family, we don't use honorifics for this relationship, just first names. However, it wouldn't surprise me if other families did it differently, especially if there was a clear generational demarcation (in my family, some once-removed cousins are much closer in age than some 1st cousins).
    – 1006a
    May 22 '17 at 15:23

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