They are different concepts. If you speak Chinese, there is a specific word for this relationship. Relationship labels should capture the actual labels people

They are different concepts. If you speak Chinese, there is a specific word for this relationship. Relationship labels should capture the actual labels people routinely use. Apple does not offer this label to English-speakers, unless you have Chinese as one of your additional languages. Similarly, if English is not one of your languages, the label for “cousin” will not appear, which is localized in an even more convoluted way in Chinese.