I know, it's frustrating that Francis slides from view between the 1861 census and Isabella's marriage in Stockport in 1878. On the marriage certificate he is described as a warehouseman and an address of Pleasant St is given, although this may be Isabella's adress. I've found the page and volume for David Maxwell Crosbie's death and am hoping to follow it up in Liverpool maybe next week. It is interesting to note that Isabella's sister Sarah, and brother John are listed in the 1871 census as living with Mary Crosbie in Gatehouse, and then 20 years later in the 1891 census they are residing with Francis and Eliza in Liverpool. Eliza is listed as a draper, John as a draper's clerk and Sarah as dressmaker / milliner so it looks like some sort of family business. Also, Eliza is listed as their mother which suggests that Mary has died in the intervening years. That's something to look up next month in Gatehouse.