Hi Kathy,
Sandra is my cousin (William was my mother's stepbrother and Mavis was my father's sister). I have not seen Sandra for about 40 years. Last I heard she was living in New York and Paris, working for a big computer company. If you email me at billjonas@optusnet.com.au I may be able to put you in touch with a relative who is in contact with her.
I grew up at Allworth and have fond memories of Eastman relatives visiting, especially a Beryl and I think her husband was Lal. She had been a champion schoolgirl swimmer. Could this be the same Beryl?
Cheers,
Bill Jonas