Shehecheyanu at a Bris and at an Inheritance
A teaching ofRav Nosson Tzvi Finkelהרב נתן צבי בן משה פינקל
Chazal ruled that a father does not say Shehecheyanu at his son's bris, because inwardly he feels the baby's pain. Yet when someone receives an inheritance, a bracha is made, because inwardly he feels financial relief. The Alter marveled at how many insights Chazal had into the human heart.
Source: Chayei HaMussar, p. 70