Originally Posted by Mbruno
Following a point of divergence in the timeline (as alternate history writers say), a new timeline arises. In this case, the descendants of King George I of the Washington dynasty are not guaranteed to be the same persons as the descendants of President George Washington in our timeline, so your question is impossible to answer.
Of course, as is acknowledged by the creator of the video. However, what do you think would be the most likely successor for George Washington himself: his adopted son, his nephew by his elder half-brother Augustine, his nephew by his younger brother John - or, one that I would add: his nephew by his younger brother Samuel?