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 ...
°)
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