Julie On the Queensland indexes are the following in reference to Samuel Jennings - 1. Samuel Jennings married Alice Amy Catchpole on 12 Nov 1884 ref - 1884/001425
2. Samuel Edward Jennings born 25 Sep 1885 ref - 1885/B035091 - he died 12 Jun 1890 ref - 1890/B023105
3. Alfred Henry Jennings b 8 Dec 1887 ref - 1888/B040189
There is no record of Alice Amy's birth in Queensland. There are no shipping indexes on people sailing to the UK but there are immigration indexes [ for assisted passage] into Australia. I checked the Qld. State Archives site and there is a - Saml. Jennings, aged 23 yrs, arriving in Qld. on 7 Nov 1882 - ref - IMM/117 - M1699
I suggest that you purchase the marriage certificate for Samuel to Alice as it would contain their ages, places of birth, occupations, addresses and the parents names of both . [These have both the father's and mother's full names.]
The address for bdm certificates for Queensland is - Queensland Registrar of BDM, 110 George St Brisbane 4000 Queensland or PO Box 15188, City East, Qld. 4002 [ their email address is - firstname.lastname@example.org ] Cost is $25 aud per certificate.