While expressing a lovely sentiment, it’s highly doubtful that the the purported Letter from Einstein to his daughter, Lieserl, was written by Einstein himself. See https://www.huffpost.com/entry/the-truth-behind-einsteins-letter-on-the-universal-force-of-love_b_7949032
Dan Bruiger
(Editor’s note: The Huffington Post article cited does not conclude that Einstein did or did not compose the letter referenced.)