Glendamak on Family Tree Circles

All I know of this couple is that they are noted on the death certificates of two brothers ,John, Born C 1792 in Tyrone and George, born C 1802 in Tyrone.
Firstly George Lindsay arrived in Australia aboard the "Orestes" in May 1841, with his wife JANE MACAULEY who he married in Tyrone in 1826 and their five children. The children were all born in Fintonia Tyrone.
William - 1829, John - 1832, George - 1834, Anne Eliza - 1838, and Thomas Francis - 1840.
This family settled in Unanderra, NSW Australia and are my direct line.
John arrived about ten years later in 1852, with his family, aboard the "Kate".Unfortunately his wife LILLIAN COCHRENE died on voyage but their children survived the voyage out. They were all born in Fintonia, Tyrone. their names are;
ELIZABETH - 1828, MARY, 1830, DAVID - 1831, WILLIAM - 1835, JOHN - 1836, ANDREW - 1839, LILLY ANN - 1843 and JAMES - 1845.
John and his family settled at Shellharbour where he died in 1870.
Any information on their parents WILLIAM & MARY or other siblings would be most appreciated as I have been looking for over ten years to no avail.
Glendamak.