norwaywolf123

If that was what the prophecy, prophecised, then the prophecy has already been broken. Tyrells could also have hoped for Willas to take over House Stark while his younger brother Garlan rules House Tyrell.

If so, is Arya fertile or has potential for fertility while not wearing any faces?

As in? Cannot Westerosi somehow hunt the dragons down and kill them, even if it would be difficult? Would not wild dragons only live for themself? I think that dragons controlled by some person are much more dangerous than wild dragons. Wild dragons may eat the lifestock and sometimes attack humans, but it was dragons controller by humans who burned the fields, the cities and potentially caused a famine. If they call a council to adopt a heir then they should choose a person who follows the Faith of the Seven and is from the South(Riverlands, Vale, Westerlands, Crownlands, Reach, Stormlands). This person would represent the core of any united Westerosi kingdom. You are right. This seems to be a trend. Great idea! But perhaps all dragons need to die for Daenerys to become fertile again?

Can Feudal ruler adopt their heirs? Must not heirs share a blood connection with the ruler to be able to inherit?

I disagree that Daenerys seeks to empowering all people, she is mostly about empowering herself. She was willing to conquer Westeros with Dothraki, which will lead to the subjugation of the natives. Still she is certainly more egalitarian and tolerant than many other characters in ASOIAF.

Assuming that they really are infertile. Causes of infertility may be blood magic in both Dany's case(Dragons) and Jon's case(Resurrection).

That is true.

Some Andals or people who Stark percieved as Andals attacked Stark's kingdom. The vilagers that Stark attacked may not even have participated in the "Andal" attack on the North. These Andals were guilty by association. #NotAllAndals

The North may allow for it even if it has not happened yet. Sometimes it comes down to circumstance.

Nobody is completly unrelated.

Female nobles may have less rights than noble men, they may also be discriminated against, but they are still noble. Being noble means that these women are part of the Westerosi elite. Most Westerosi men(and women) occupy a lower socio-economic position in Westerosi society than female nobles. Also female Starks are part of one of Westeros greatest houses, meaning that these women are close to the top of the Westerosi totem pole of status.

All Targaryens (assuming they are trueborn) have Targaryen y-dna. But the further away the common ancestry of some targaryen males, the further away the latest shared paternal ancestor.

Tywin's brothers got their own children much later than Tywin did. For example Lancel is the eldest of Tywin's nephews thru his brothers. Lancel is much younger than Jaime and Cersei.

What i meant with unbroken male descent is that a house has a direct paternal line to the founder. I am talking about paternal descent as in y-dna. Y-dna is the male sex chromosome. A key feature of the Y-dna is that it is only passed on from biological father to biological son. The Y-dna rarely mutates which makes it usefull for genetic research.

Even if a woman rules a house, the paternal line of that house can persist. If she is married to a cousin, or another male that shares her fathers paternal line.