Thanks, Rata. But I think you missed the requirement in the OP that uncle/aunt by marriage doesn't count.

> > > "Direct" means blood related, i.e sibling of one parent, not "uncle by marriage".

In hindsight it becomes clearer why breeding dogs would be a better setting for this puzzle.

Dogs don't know marriage, divorce and soap operas° ... ;)

And many breeders rely on incest, restricting them to uncle/aunt relationships would be a "moral" advantage.

Update

The trivial solution (of many) if "by marriage" was allowed ...

<Reveal this spoiler or all spoilers in this node or all in this thread>

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

°)

<Reveal this spoiler>

In reply to Re^3: Pairing Riddle (OT) by LanX
in thread Pairing Riddle (OT) by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.