Second sentence, the word January should be capitalized.
Third sentence, the word "the" at the beginning of the sentence should be capitalized.
Fourth sentence, Frick Foundation should be capitalized.
Fifth sentence, Easter should be capitalized.
Sixth sentence, day in Valentine's Day should be capitalized.
Eighth sentence, the word "we" should be capitalized as the children are telling their parents about how they learned to keep their own financial records.
Ninth sentence, Claus should be capitalized, as it is part of a name.