I have found theses baptisms on familysearch
All to parents Richard and Maria Warner
6 Nov 1853 St Nicholas brighton
Maria Christiana Warner (possibly she is Kate Maria in 1881 ??)
Maude warner 7 dec 1856 St Nicholas Brighton
Emma Jane Warner 2 Oct 1859 St Nicholas Brighton
Richard Erneast Warner5 Oct 1851 Brighton
Horace warner
Frank Warner
5 Mar 1865 St John Brighton
also -possibly Maria Postlethwaite was really maria Batchelor??
FreeBMD shows Maria Batchelor on same page as Richard Warner
family search shows
Marriage
14 April 1849
St Nicholas Brighton Sussex
Richard Warner father Richard warner
Maria Batchelor no father's name given
so maybe Maria was illegit daughter of Amelia -who married Edward Postlethwaite?

?
Wonder if Horace was in some kind of trouble - so he added another surname and altered his age

It has been done before??
Suz