Direct ancestors are a bit squicky, of course, but I suppose that a sibling of one's seven or eights-great grandparent isn't all that different to one's seventh or eighth cousin, assuming, of course, that one can meet said relation under circumstances which a) minimise the potential for temporal paradox and b) allow both parties to be of compatible biological ages.

I was thinking mostly that tricksters are not known for their observance of traditional boundaries. It's one of their defining characteristics.