Samuel Isaacs - No birth or death date

We do.
Guy Jenning wrote about him for tge Margaret River Historical Society.
https://mrdhs.com.au/the-isaacs-family/

I've updated his profile accordingly.

There was an incorrect marriage date of 1897, it is 1870.

Also, Lucy Major and Lucy Lowe seem to be the same person.

BDM WA Marriage 1870/3068 Busselton; Isaacs, Samuel, to Major, Lucy

Children registered to Samuel Isaacs and Lucy Lowe;

1872 John (Jack); 1875 Lucy Mona; 1877 James Herbert; 1879 Samuel Andrew; 1882 Frederich Augusta; 1884 Agnes Maria; 1887 Henry.