There were other humans unrelated to Adam, according to Genesis 4:16. Cain was exiled to a land east of Eden, where he found a wife and had children. This implies the existence of other peoples even from a literalist perspective.

As for the evolutionary perspective, the degree of relation is key; it’s hardly appropriate to consider two species the same simply because they shared a common ancestor at some point prior. If that were the case, nearly anything with a spine could be considered a human relative.

The distinction between “related in a evolutionary sense” and “related in a genetic/ancestral sense” is somewhat muddy, but in terms of connotation I believe your original comment to be largely pedantic.