Thanks Jean C, Donna & Viv for sorting this one out. My website has now been updated with Mgt Corlett and Thomas Cain as Mgt born 1830's parents. I believe her grandparents were Wm Cain and E. Quine.

ht tp://tdaustin.com/manx/per01573.htm#0

One other complication - I have Mgt born 1830 as marrying 3 men - before Robert I have her married to Henry Cain who shows up as being 17 and living with Mgt Cain 20 in 1851 census (along with Robert). Not sure where I got this however so it may be bogus.
Tim