After their father's death Fritz took over to a large extent the guidance of his younger brother this relationship started with advice and help with his studies and gradually developed into a close scientific collaboration, culminating in the famous London theory of superconductivity. The great influence in Heinz’s subsequent development was his brother Fritz who was seven years his senior, and the only other child. Heinzs childhood, his father had to rest a great deal when he was not working so for Heinz he was rather a remote though beloved and respected figure. His father, Franz London, was a professor of mathematics at the University of Bonn and his mother Luise, née Hamburger, was the daughter of a prosperous linen manufacturer The home was happy and peaceful but his father had a congenital heart ailment and died when Heinz was only 9 years old during. Heinz London was born in Bonn on 7 November 1907 into a well-to-do liberal German-Jewish family. These two children, or more accurately their supporters, immediately flung themselves into a battle for the throne. , which should make him no more than twelve, the age of social maturity in tenth century England. We do not know the age of Edward, but he is called a ‘child ungrown’ in MS C of the
Aethelred was at most nine years old in 975, making all possible allowance for the speedy consummation of his mother’s marriage and the birth of his elder brother.
The reputation which has attached to the mild Aethelred would hardly apply to his mother, who involved herself with great purpose in the advancement of her two sons. Aelfthryth was the mother of two sons: Edmund, who pre-deceased his father in 972, and Aethelred, better known to history as Aethelred Unraed. She had disappeared early in the reign, before Edgar took as his wife and queen the lady Aelfthryth in 964. Edward’s mother was dead or otherwise disposed of by 975. The eldest Edward the martyr was the son of his first marriage to a lady named Aethelflaed. Eadgyth, his daughter, was abbess of the nunnery at Wilton, appropriately enough since she was the daughter of the nun Wulfthryth. He had ruled the whole of England for sixteen years, since the age of sixteen, and the northern parts of it at least since the age of fourteen. In this year (975) Edgar, king of the English, reached the end of earthly joys, chose for him the other light, beautiful and happy and left this wretched and fleeting life’