Groucho Marx is known for his letter writing. This collection is great, but not as good as The Groucho Letters. Since these are only to his daughter, Miriam, they don't reflect aspects of his personality that show up in The Groucho Letters, which are collected from diverse people, family, friends, and other show people, not to mention Warner Brothers during a law suit.
But I love this collection because Groucho comes across as a loving and concerned parent who can't get enough of his children. He is supportive, generous, thoughtful and witty.