Blackfacesheep,
Starting with your father and working back I've found your grandparent's marriage, but although your grandfather was born in Lancashire they actually married in Scotland.
19 March 1890.
Robert Steel, a Seaman in the Merchant Service who was a widower (which may come as a surprise to you)
Mary Jane McGuigan, age 26, was a Spinster and described herself as a Dressmaker.
The marriage appears to have taken place at Mair or Muir Street in Govan, in Glasgow.
Robert's father was John Steel, Chief Officer in the Merchant Service, and his mother was Jane Steel, MS (maiden surname) Owens, so that ties in with the information Momamg has already found for you, and the family story you started with.
Mary's father was Thomas McGuigan, who was deceased but his occupation had been Livestock Dealer, and her mother was Margaret Myles. Her mother had obviouly married since Thomas McGuigan's death as she gives 3 surnames, Margaret Myles, previously McGuigan, MS McKie
What I find fascinating is that the Minister who officiated was the Minister of the church where my own great great grandfather was working as a City Missionary at the time
If you go to SP (scotlandspeople.gov.uk) you can do the search and look at the original record. You need to register, which is free, as is initial searching, but you need to buy credits to look at the results you want to view in detail. This would be worth your while viewing as it will give you a copy of the original certificate.
Added: Sorry, I should have given you the reference for the marriage certificate. It's 646/01 0037.
Based on the information on that you should now be able to find more detail on John Steel and Jane Owens because if, with luck, they married in Scotland as well you will be able to find their marriage with details of their parents, which may add to what Momamg has already found. (or may not, there's a lot already been posted).
I've also sent you a PM (personal message). Look at the very top line of the site, at the right hand corner, and it should tell you there is something in your site inbox