Geoffrey was only born in 1929. The children on the voyage were born 1845 & 1848 so unlikely to have any connection to him.
“And on her marriage to Geoffrey the mothers name is also blank“
Mothers names are never shown on English marriage certs - only fathers??
The witness JL Baird was Geoffrey’s brother James L Baird born 1927
If she was born in 1928 - she was a minor when she married in 1947. What age is shown for her on the 1947 marriage cert?
Have you checked freebmd - there is no birth reg for an Ethel Quin/Quinn in the March qtr 1928
www.freebmd.org.ukGeoffrey’s marriage in England in 1959 indicates they either divorced or Ethel died. It may be an idea to buy a copy of that marriage cert to establish his marital status at that time.