I have some children that do not belong with the people I have put them with - can you please help

On my tree I have a WILLIAM & MARIA (nee Saywell) TARRANT

The children I know that shouldn't be there, but who I have left there for the time being, are
Leonard Matthew Tarrant b.1871 in Lower Moutere, New Zealand
Lionel Kendall Tarrant b.1875 in Lower Moutere, New Zealand
Ida Blanche Tarrant - b.1876 in Lower Moutere, New Zealand

Child that is in doubt is:
Lily Annie Tarrant b.1877 - d.1963 in Whakatane

I have found that the father of the 3 known children was Henry Alexander Tarrant born 1880 in Lower Moutere, Nelson, NZ
I would like to now if he was related in any way to William Tarrant who was born in Beechingstoke, Wiltshire, England in 1824 (of the above link)