IGI has:
Offspring of John QUILLIAM & Christian CLUCAS

1. John QUILLIAM - Christening: 29 Sep 1771 Balla Kelly, Marown, Isle Of Man (m Margaret Christian STEVENSON 21 Dec 1817 Arbory, IOM ?)
2. Elizth QUILLIAM - Christening: 13 Mar 1774 Marown, Isle Of Man
3. Tho QUILLIAM - Christening: 28 Apr 1776 Marown, Isle Of Man
4. William QUILLIAM - Christening: 11 Oct 1778 Marown, Isle Of Man (m Jane QUINE ?)
5. Margaret QUILLIAM - Christening: 12 Jan 1781 Marown, Isle Of Man
6. Mary Ann QUILLIAM - Christening: 23 Feb 1783 Marown, Isle Of Man
7. Robt QUILLIAM - Christening: 27 Sep 1789 Marown, Isle Of Man (m Elinor QUAYLE ?)
8. Jane QUILLIAM - Christening: 15 Aug 1792 Saint Mathews, Douglas, Isle of Man (m William McCLELLAND ?)

If the above marrisges are accurate. Their offspring are obtainalbr using the "custom search" option of www.familysearch.com