Hi
Further to my last reply found these entries on marriage index and one on death index

Christopher Marchant (father Henry Thomas Marchant)
married 1/8/1936 Registry Office Adelaide South Australia reg no Ade 369/2983
(at time of marriage Christpoher was aged 27 yrs and spouse aged 22 yrs)
spouse Roma Edith Winsome Young (father Andrew William Young)

Henry Thomas Marchant (father Henry Thomas Marchant)
married 24/4/1937 All Souls Church St Peters South Australia reg no Nor 377/1790
(at time of marriege Henry was aged 29 yrs and spouse aged 25 yrs)
spouse Phyllis Charlotte Hughes (father Hugh John Hughes)

Catherien May Marchant (father Henry Thomas Marchant)
married 17/9/1927 Res of Rev J T Deacon at Torrens Park South Australia reg no Ade 312/861
(at time of marriage Catherien aged 21 yrs and spouse aged 22 yrs)
Spouse Edmund Thomas Sharpe (father Edmund John Sharpe)

Death entry for
Christopher Marchant
died 21/2/1965 Hackney Nr Adelaide South Australia reg no Ade 987/1370 aged 56 yrs

Hope this info is of help to you.
Cheers marg