Wm. & Minnie (Nee Morgan) /daughter Evelyn

I am looking for the marr. cert. of my great grandparents.The 1911 Census form B no.33 states Wm. was 28,a rivetter(Titanic) + married 7 yrs.Minnie,nee Morgan was 25 & both were Presb. religion.They had Wm.(4),Lillian(2) and Evellen- my gran-(0).All wre born City of Belfast except Minnie, born Co. Tyrone.(I hope to get their parents' names.My gran's b.Cert. (reg.Urban 12 Belfast ,Entry no.385 ) states d/b 12/3/1911,born 33 Kenilworth Street ,  I also hope to trace her marr. cert. she wed Robert Gichrist (from Glasgow) circa1930 . Other family stories say Minnie had 22 children(Gladys/David/Violet/ Samuel are among those who lived). She had to leave Belfast after her husband in an incident involving a racing horse?? This is all we know.I do hope that you can help me in my search and.maybe providing more?  Thank you