Did noble sons inherit land, join the army, and enter the Church?

How accurate is the idea that a noble's first son inherited, the second joined the army, and the third entered the Church?

It was a plausible pattern, but younger sons' paths depended on education, family wealth, patronage, and available military or ecclesiastical offices.

A viewer asks whether an eldest son inherited, a second entered military service, and a third became a priest. The eldest normally received the land and title, while a younger son often sought income and advancement as a knight in royal service. A third son might enter the Church if he had the education, but a wealthy family could also purchase an abbacy or another senior position for him. Inheritance custom, military patronage, learning, and family money mattered more than a rigid three-part rule.