Learn English – Word meaning “find the truth of”

Verisimilitude. It's hardly used these days (even in Gilbert & Sullivan it was only for comic effect), but that's undoubtedly what it means.

There is the idiomatic expressions pride and joy:

• The object of one's great pleasure, as in "Our new grandson is our pride and joy."

(This term was probably invented by Sir Walter Scott in his poem Rokeby (1813), where he described children as "a mother's pride, a father's joy.")

(American Heritage® Dictionary of Idioms)

Susan was the family's pride and joy.