So, my friend was wandering around and decided to ask a random dwarf about his family. We became intrigued at this dwarf when he informed us that one of his cousins is also his uncle. It was quickly determined that this isn't actually possible by conventional genaeology, so we continued to ask him about his family. Over time, we have determined that:
He has at least 3 other uncles who were also cousins.
His mother is also his cousin.
His maternal grandmother is also his aunt.
As we were unveiling this sordid tapestry of lust and depravity, an even darker thread became known. A disproportionate number of his children, at least 5 out of 8 that he's told us about, were killed by a Titan going by the name of The Waxy Mist. This was intriguing, but then he saw fit to inform us that his 6th eldest daughter, the only child we know of who isn't dead, worships the Waxy Mist. Even worse, his wife began worshipping the Waxy Mist about 12 years before she married him. Now, the only way this can be interpreted is that there's an extended clan of dwarves so inbred that their family tree can only be portrayed in four dimensions who, in order to appease the mighty titan that lives near them, give it a constant supply of delicious, bearded children. The fact that his only surviving daughter is also the only one who worships the Waxy Mist supports this theory. Finally, one of his other cousins is also the king of a civilization going by the name of the Spines-Chambers of Ash. I'm scared now.