If that is the family,this looks like them arriving in NZ
William LEAMAN aged 25
Mary A aged 32
George aged 6
Samuel aged 4
and sadly
William aged 7/12's in the margin (dead)
Here's a theory...

I'm inclined to agree with Janette in that the Mary Ann d.1915 that I mentioned in my previous post is the one who migrated from Devon to NZ in 1874 aboard the Rakaia. Her husband William and three children accompanied her.
As I read it FreeBMD has this Mary Ann and William marrying in Newton Abbot, Devon in 1867 Q4. Mary Ann is a LEAMAN by birth.
I think William and Mary Ann are listed on the 1871 UK census along with their son Samuel.
This means the three children who traveled on the Rakaia are older siblings of Alice. Not sure why they're not mentioned on the above "In Memoriam" notice, but then again neither was Alice.
(Having said that, there is a possible William and Mary Ann LEAMAN listing on the 1891 census as well, which means my theory is wrong. I only have access to LDS to view the censuses, not ancestry, so I can't be sure)The oldest son Samuel may be the 1945 burial listed on the Ashburton cemetery website.
Not sure where/if the convict William b.1809 mentioned on Mundia fits in.
Like I said, just a theory
Regards
Beg