I omitted the last address in the UK for Albert and Kathleen...it was 18 Willis Road, Gale Green, Stockport.
Marriages Sep 1928   
HYDE    May A   Stockport    8a/36     
PENNINGTON    James  Stockport 8a/36
James 
PENNINGTON, 44 years Engineer; May Alberta 
PENNINGTON, 43 years,   Miss E M 
PENNINGTON * years and Miss D V 
PENNINGTON * years embarked on the 9 May 1947 on the 
RANGITIKI for New Zealand.  Last address in the UK 7 Brook Road, Heaton Chapel, Stockport.  Country of last permanent residence England.  Country of intended permanent residence, New Zealand.
Death in South Australia
PENNINGTON James
19 Aug 1970  69 years  Status Married  Relative May Albert PENNINGTON [Wife/Widow]
Residence South Brighton  Death Place South Brighton   Ade 97A/6514
http://www.centennialpark.org/deceased-search.htmlJames 
PENNINGTON was cremated at Centennial Park Cemetery on 21 Aug 1970.  Last abode Sth [this would be South Brighton]
May Alberta 
PENNINGTON died on 16 Apr 1983 and was cremated on 19 Apr 1983 at Centennial Park Cemetery.  Last abode Oaklands [this would be Oaklands Park]
I suggest you contact the State Library of South Australia and request a copy of both Albert's and May's death notices as hopefully it will give details of their daughters.  Please give the date of death and cremation to help them locate the notices in 
The Advertiser.
http://www.slsa.sa.gov.au/site/page.cfm?u=387Scroll down to Research Request and click on Ask a New Question - an online request page opens.
Cheers  

Cando