Birth and Childhood of Baha'u'llah, by David Merrick (2008). Childhood and Early Life of Bahá'u'lláh, told in plain English and suitable for reading aloud.
Two Episodes from the Life of Bahá'u'lláh in Iran, by Moojan Momen (2019). Regarding the conference of Badasht and Baha'u'lláh's arrival at the shrine of Shaykh Tabarsi, and on His experience in the Siyah Chal, close attention to the text of two Tablets leads to conclusions that differ from current Bahá'í history books.