On the crown he passed to George II, then George III (who was George II’s grandson and successor due to for him Father, Prince Frederick, was the first to be born with three names, George William Frederick. He then gave George III’s son and successor, George IV (born George Augustus Frederick), a middle name for his daughter and only heir.
Princess Charlotte Augusta died before her father, so George IV’s younger brother, another William Henry, succeeded him as King William IV. (So, the current Prince Williamalso known as William Arthur Philip Louis, who was the eldest son of the now-reigning Prince of Wales, likely William V.)
Then again, William IV never bothered to make it official with any of the ladies in his life, so his countless children could not succeed him. When he died, the property turned to his niece – who was Just The legal child of William’s younger brother, Prince Edward.
That was my sister’s daughter Queen Victoriawhose 63 years and seven months on the throne was a record until Queen Elizabeth II crossed the mark in 2016 and ended up reigning for 70 years.