Some further information on Giovanni Battista and Elizabeth Lawson's marriage. I paid for 1-hour research from TW Archives, to search the marriage records of St. Mary's RC church Sunderland. 1870 - 1878. No record of marriage was found for Giovanni and Elizabeth. So, that rules out an earlier unregistered Catholic marriage.
However, there was a record found on FreeBMD for an Elizabeth Ellen Lawson married in Sunderland, 1873. To either a John Henry Ooughtred/Oughtred or John Morrow. March ¼ 1873 Sunderland 10A / 746.
I checked the Sunderland indexes, and there's an 1873 marriage to an Elizabeth Lawson and John Marrow (C026BK15/477), no record of a Lawson and Ooughtred/Oughtred marriage. So, it appears John Morrow/Marrow married an Elizabeth Ellen Lawson in 1873. If it's the same Elizabeth who later on married Giovanni, then she would've been 19 in her marriage to Morrow.
I couldn't find a death record of a John Marrow in Sunderland, between the dates of 1873-1878. The 1885 marriage of Giovanni and Elizabeth only names the husband as a widow, and Elizabeth as a spinster. I wonder if she did have a prior marriage. With Giovanni apparently already married at the time of Pasqualino's birth and potentially Elizabeth too, I suppose that does make a lot of sense as to why they didn't marry before the birth of their first three (or however many) children.