Hi Tiki,
These are the only Somerville births listed:
Margaret Somervile born Perth 6.5.1796 d/o George Somervile & Catherine Ding, baptised 8.6.1796 Perth by David Sangster, minister Dissenting Congregation.
Mary Somervile born Perth 28.12.1800 d/o George Soervile & Catherine Ding, baptised 4.1.1801 Perth by Alexander Couts, minister Dissenting Congregation.
James Sommervail born Perth 23.11.1798 s/o George Somervaile & Catherine Ding, baptised 25.11.1798 Perth by David Sangster, minister Dissenting Congregation.
Janet Sommervile born Pomarium 1.7.1803 d/o George Sommervile & Katherine Ding, baptised Perth 6.7.1803 by Robert Little, minister Dissenting Congregation.
Jean Sommervile born 24.8.1805 Pomarium d/o George Sommervile & Catherine Dind, baptised Perth 3.9.1805 by William Young Congregational Church.
George Summervile born 25.11.1793 Perth s/o George Summervile & Catherine Ding, baptised Perth by David Sangster Dissenting Congregation.
Sorry, nothing for Catherine born c. 1825.
Jill