Interesting as you say Minnie, throwing these into the mix as well, since you mentioned two brothers with the names Michael and Laurence

These will need to be verified if they belong to the same family .... remember that dates of birth on here are taken with a pinch of salt.
Name :
HALLASSY Jane
School : Hampden
Register Number : 51
Admission Date : Jan 1882
Parent / Guardian : M Hallassy
Address : Hampden
Birthdate :
Oct 1874Last Day : 06 Aug 1886
Destination : Gone to service
Further enquiries to Oamaru Branch - NZSG
Name :
HALLASSY Lawrence
School : Hampden
Register Number : 110
Admission Date : 17 Sep 1883
Parent / Guardian : Michael Hallassy
Address : Hampden
Birthdate :
24 Jul 1878Further enquiries to Oamaru Branch - NZSG
Name :
HALLASSY Lizzie
School : Hampden
Register Number : 39
Admission Date : 21 Mar 1881
Parent / Guardian : A M Hallassy
Address : Hampden
Birthdate :
Nov 1869Last Day : 24 Mar 1881
Further enquiries to Oamaru Branch - NZSG
Name :
HALLASSY Theresa
School : Hampden
Register Number : 107
Former Reg. No : 48
Admission Date : 10 Sep 1883
Parent / Guardian : M Hallassy
Address " Hampden
Birthdate :
10 Jun 1871Name :
HALLASSY Michael
School : Hampden
Register Number : 11
Admission Date :Jan 1880
Parent / Guardian : M Hallassy
Address : Hampden
Birthdate :
Jun 1873I notice there is a death for a Michael Hallasey in 1924 aged 53 at Hampden Cemetery
Cheers
KHP