Six years later, I have found quite a bit more information, and corrected lots of mistakes in my 2014 post.
Here's what I have as of November 2020:
1. John Saunders, blacksmith. Born 25 Sep 1801 in Kirkton of Auchterhouse, Scotland.
Married Isabel (Bella) Mcgregor (b 9 Jun 1799, Cupar, Fife) on 28 June 1828 in Auchterhouse,
Issue of John Saunders and Isabel Mcgregor:
i. son James Saunders, b. 27 Oct 1829 in Auchterhouse, d. 24 Feb 1885, Lochee, m. Grace McLean, 22 Dec 1849 in Auchterhouse
ii. son Thomas Saunders b. on 25 Oct. 1831 in Auchterhouse., d. 16 Jan 1857, Auchterhouse
iii. dau. Margaret Nisbet Saunders b. on 1 Jan. 1835 in Auchterhouse; died 6 Feb 1878 in Lochee
iv. son David Coupar Saunders b. on 20 Jan. 1837 in Auchterhouse.
v. dau. Agnes/Anne Saunders b. about 1838 in Auchterhouse, d. 1855, Auchterhouse
vi. dau. Euphemia Meldrum Saunders b. on 8 April 1839 in Auchterhouse
2. James Saunders, blacksmith, son of John Saunders [no. 1] and Isabel Mcgregor. Born 27 Oct 1829 in Auchterhouse, died 24 Feb 1885, Lochee
Married Grace McLean, dau. of William McLean and Marjory (May) Guthrie, on 27 Dec. 1850 in Auchterhouse. Grace McLean b. 20 Apr 1829 in Alvie, Invernesshire, d. 2 Oct 1888, Lochee
Issue of James Saunders and Grace McLean:
i. son James Strachan Saunders I b. on 21 Jan. 1850, Kirkton of Auchterhouse, d. 14 Jul 1901, Glasgow, m. Agnes Hay, 8 Nov 1872, Dundee
ii. dau. Sarah Watt Saunders b. on 8 Sep. 1852, d. 23 Feb 1855, Newtyle
iii. son William Sanders b. 28 Jan 1855, Newtyle, m. Janet Ness, 16 Feb 1874, Kircaldy, Fife
iv. son John Saunders b. on 3 Dec. 1857, Pitpointie, Tealing, d. 15 Jan 1910, Stark, Ohio, USA, m. Grace Miller, 13 Dec 1888, Stark Ohio, USA
v. Thomas G. Saunders, b 12 May 1860, Pitpointie, Tealing, d. 4 Nov 1932, Huntington, Indiana, USA, m. Georgiana Deans, 22 May 1880, Lochee
vi. Bell McGregor Saunders b. on 25 Sep. 1863 in Pitpointie, Tealing, Angus, Scotland; d. on 14 March 1931, Brought Ferry, m. George Flight McLeish 13 Apr 1887, Lochee, Angus, Scotland
vii. Elizabeth McLaren Saunders, b. 20 Jan 1865, Lochee, d. 20 May 1940, Dundee
viii. Lillias Gray Saunders, b. 28 Mar 1867, Lochee, d. 15 Apr 1868, Lochee
ix. Margaret Millar Saunders, b. 1 Mar 1869, Lochee, d. 24 Jun 1869, Lochee
x. dau. Christina (Tena) McLean Saunders b. 19 Jan 1871, Lochee, d, after 1910, US or Canada
xi. son David Miller Saunders I, b. 4 Jul 1873 in Lochee, d. 2 Feb 1948, Hicksville, Ohio, USA
3. Thomas G Saunders, son of James Saunders [no. 2] and Grace McLean. born 12 May 1860 at Pitpointie, Tealing, d. 4 Nov 1932, Huntington, Indiana, USA, m. Georgiana Deans, 22 May 1880, Lochee
( dau. of Thomas Deans and Agnes Dingwall) Georgiana Deans b. on 23 Dec. 1860 in Old Machar, Aberdeenshire, Scotland; d. on 24 Dec. 1917 in Cedar Falls, Black Hawk, Iowa, USA,
Issue of Thomas G Saunders and Georgiana Deans:
i. son Thomas Deans Saunders b. on 28 April 1881 in Lochee Scotland; d. on 13 March 1961 in Byron, MI, USA,
ii. son James Strachan Saunders b. on 22 Oct. 1885 in Lochee, d. 25 Feb 1966, Branson, Missouri, USA, m. Eva Aletha Snyder 17 Dec 1903, Elkhart, Indiana, USA
4 iii. twin son William Saunders b. on 6 Oct. 1887 in Goshen, Elkhart, Indiana, USA; d. on 29 March 1888, Elkhart, Indiana,
iv. twin son John Saunders b. on 6 Oct. 1887 in Goshen, Indiana, USA, d. 27 Jan 1942, Swissdale, Pennsylvania, USA, m. 20 Apr 1907 (1) Josie Mayes, m. (2) Mary Conville
v. son George Maynard Saunders b. on 11 Aug. 1889 in Goshen, IN, USA, d. 8 Dec 1964, Huntington, Indiana, USA, m. Elsie Ulrich, 21 Aug 1914, Huntington, Indiana, USA
vi. son David Miller Saunders b. 4 Jul 1891 New Paris, Indiana, USA; d. 25 Aug. 1973 in Champaign, Champaign, Ilinois, USA