Looks like Sylvia had a brother Jack (possibly John, Johan):
Page 17, 3rd column: http://nla.gov.au/nla.news-article93127826
Jamjar
Possibly from her father's first marriage.
I can’t see a first marriage, or Jack. There is this though, with correct father, or father is Sylvia’s grandfather, from a fling.
1892 Gotthilef Hugh father Christian Gotthilef KLICHE mother Louise GARRAT
I also can’t see birth of Christian Jnr (Sylvia’s father) who, if is the one who died in 1946, would have been born 1870: Dudley Park KLICHE Christian Gotthilf 76y 1946
Sylvia’s grandfather’s second wife re-married in 1910 MULLER.
Children to 1st, Johanna STILLER, died 1880: 1871 Auguste Bertha, married 1888 KEIL, died 1963; 1873 Caroline Lydia died 1873; 1875 Emma Louise is at at Siegersdorf Lutheran Cemetery; Cornelia Maria married 1897 LINDNER, died 1976.
Children to 2nd, Maria NITSCHKE: 1895 Carl Bernhard; 1889 Rudolf Theodor, died 1944; 1894 Oswald Herbert married 1917, died 1974; 1896 Gotthard Walter married 1921 died 1975.
Carl Bernhard attacked step-father with an axe, 6th column:
http://nla.gov.au/nla.news-article1549336784th column:
http://nla.gov.au/nla.news-article163150709Martha divorce and death/funeral notices:
1st and 4th columns:
http://nla.gov.au/nla.news-article73993300Rudolf Theodor death notice, 2nd last column:
http://nla.gov.au/nla.news-article166390508Death notice: Advertiser KLICHE Herbert Oswald 1974
Death notice: Advertiser KLICHE Gotthard Walter 1975
Death notice: Advertiser LINDNER Maria Cornelia 1976
Is this Emma Louise?:
https://billiongraves.com/grave/Emma-Louise-Kliche-Falkenberg/12190760Marriage: 1892 172/403 FALKENBERG Berthold to KLICHE Louise Angaston
Death of Maria Lindner’s husband, page 45, 2nd column:
http://nla.gov.au/nla.news-article93939693Bethany New Lutheran Cemetery LINDNER Johannes Bernhardt 1953
https://billiongraves.com/grave/Maria-Cornelia-Kliche-Lindner/10894378Jamjar