Randell Randell Major from Southampton England

RANDELL OR RANDELL-MAJOR – I believe this was a hyphenated surname, but often the second half was left off.
My line begins with George Randell, who married Mary, I have no birth or death dates for this couple at all. They had five children between them, but I believe George died whilst the children were still young. The children were: Jane Randell (b:1848), Rebecca Randell (b:1853), Thomas Randell (b:1855), Ellis Randell (b:1858), Georgina Randell (b:1864). Rebecca is my ancestor, but I would like to determine what happened to her brothers and sisters, as well finding out more about her parents/grandparents.