Hi. That sounds like an interesting challenge! I've probably mentioned it somewhere before, but I am descended from two of James Miller* Killen's siblings. What do you know so far? Which of his children do you suspect?
*(you say E, rather than A?)
For reference:
(Rev) James Miller KILLEN born 25 Oct 1815
m. (firstly) Martha Jane YOUNG on 22 June 1843, and they had:
1. Martha, b. 13 Jun 1846
2. Jane Young, b. c1847
3. James Miller, b. c1848
4. Margaret, b.c1849
5. George Edward, b. 27 Apr 1851
JM Killen m. (secondly) Margaret Rebecca Bryson SINCLAIR on 12 Oct 1853, and they had:
6. Elizabeth Sinclair, b. 6 Oct 1854
7. Jonathan Edwards, b. 8 Jan 1856
8. Blanche Brice, b. 27 Feb 1857
9. Ellen Orr, b. 18 Dec 1858
10. William Wilson, b. 31 Jan 1860
11. Edward Brice, b. 18 Oct 1861
12. Samuel McCausland, b. 4 Sep 1863
13. Albert Ernest, b. 24 May 1865
14. Henry Herbert Sinclair, b. 25 Nov 1866
By the way, a few of the details I posted at the start of the thread are a bit confused, but Rootschat doesn't seem to let you edit your own posts after a while.