Benjamin Mancha married Florence Fitzgerald in Sydney, New South Wales, in 1906.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Marriage registration # 530/1906<br/>Groom: MANCHA Benjamin, Bride: FITZGERALD Florence, District: Sydney</ref>
Lola was born in Woollahra, New South Wales, in 1906.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Birth registration # 30637/1906<br/>MANCHA Lola D, Father: Benjamin E, Mother: Florence, District: Woollahra</ref>
Ena was born in Paddington, New South Wales, in 1908.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Birth registration # 17427/1908<br/>MANCHA Ena M, Father: Benjamin E, Mother: Florence J, District: Paddington</ref>
Stella was born in Petersham, New South Wales, in 1911.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Birth registration # 20017/1911<br/>MANCHA Stella E, Father: Benjamin E, Mother: Florence, District: Petersham</ref>
Hilda was born in Petersham, New South Wales, in 1915.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Birth registration # 17458/1915<br/>MANCHA Hilda T, Father: Benjamin E, Mother: Florence, District: Petersham</ref>
Grace was born in Burwood, New South Wales, in 1921.<ref>New South Wales Family History - Births, Deaths and Marriages Search (
https://familyhistory.bdm.nsw.gov.au/lifelink/familyhistory/search : 10 Sep 2022) Birth registration # 7175/1922<br/>MANCHA Grace F, Father: Benjamin E, Mother: Florence, District: Burwood</ref>
Last one has to have been born in 1921 and registered in 1922 as my search ended 31 Dec 1921. Can probably get you exact dates by searching for restricted date ranges if you want those.