I am looking for any information about the marriage and offspring of Zvi Hirsch of Kalish (aka Isaac Collins) d. 16.12.1783 who was supposedly married to Sarah Falk, daughter of Chaim Jacob Samuel Falk, the Baal Shem of London. I also need confirmation of the birth of his his son, Hyman Collins (1780-1835) and grandson Henry Collins (1807-1877). I have only found one tiny mention that Falk had a second wife and a daughter - but no documentation. Thanks for your help!