It looks like you possibly have two different families being researched: one family are the Macaulays of Levengrove and the other are the Macaulays of Rutheglen, calico printers.
For research purposes
This a basic genealogy of the Macaulays of Levengrove
1.John Macaulay of Leven Grove, Town Clerk (d. Oct. 4, 1799); said to have been a handsome man with many comely daughters{Notes and Queries, 1860}; m. in Dumbarton in 1767 Elizabeth Brown (c. 1747- 1821), dau of John Brown and Katherine Wardrop, and had,
2.Catherine , Katherine, Ann Macaulay, bapt. 1769 m.1791 in Cardross to Jacob Dixon, d. 1831 and had,
3.John Dixon
3.John Dixon, b. 1793, died young.
3.Jacob Dixon (1794-1831) m 1. Jean Brown and had issue; she was called a woman of inferior means.
Jacob supposedly m. 2 Mary Ann McCully and had additional issue.
3.Elizabeth Jane Dixon m. the Rev. William Jaffrey.
3.William Dixon
3. William Arnaud Dixon (I believe that this should be William Arnaud Dixon)
3.Anthony Dixon, b. 1800-1841; m. Jean Ewing
3.Joseph Dixon, M.P.
3.Louisa Dixon, b. 1805; m. 1 Robert Dixon, her cousin; m. 2 in 1850 to Capt. John Lee, son of Henry Pincke Lee of Wooley, Berks.
3.Catherine Ann Sophia Dixon
2.Janet Macaulay, b. abt. 1771, married 1794 to John Arnaud, wine merchant, (1762- ?1811/1815?), with issue
3.Ann Macaulay Arnaud, b. abt. 1796
3.John Macaulay Arnaud, b. abt. 1796 in London; m. Georgina Wilkinson, b. 1805 in Portsmouth, Hants.
3.Elias Macaulay Arnaud (1799-1867) m. 1845 Annie Maria Norris and had,
3.Frederick Alexander Arnaud, b. 1804
3.Louisa B. Arnaud, b. 1806; m. Oct. 10, 1827 Duncan McColl; m. St. Cutherbert's Parish, Edinburgh.
3.Henry Hawker Arnaud m 29/08/1851 to Agnes Williamson Thomson Kedslie, m. St. Cuthbert's Parish, Edinburgh.
2.Elizabeth Macaulay, b. abt. 1772
2.Jean Macaulay, b. 1775 m. 1803 to Alexander Carrick and had,
3.John Macaulay Carrick, b. 1804
3.Isabella Carrick, b. 1807
3.Elizabeth Carrick, b. 1809
3.Jane Jamina Carrick, b. 1811
3.Fanny Carrick, b. 1815
2.Margaret Macaulay, b. abt. 1772
2.Louisa Macaulay (Loisa), b. 1776 m. 1806 William Thom
3.Elizabeth Brown Thom, b. 1807
3.William Thom, b. 1811 [William Thom m.1834 Helen Mcinniven at Roe; William Thom m. 1852 Agnes Hendry at Old Kilpatrick.Which is the above William?]
2.John Macaulay (1778-1835), J.P., solicitor; tax surveyor; procurator fiscal for Dumbartonshire; partner in the law firm of McAulay and Colquhoun m. 1 Janet Allison and had,
3.John Brown Macaulay , b. abt. 1810; m. 1836 Jean Dixon, b. abt. 1816, dau of Jacob Dixon and Jean Brown, and had,
3.James Macaulay, (1812-1873), tax collector in Aberdeen m. 1856 Jane Collie of Old Macher, Aberdeen and had,
4.Margaret Landal Macaulay, b. 1857
4.Alice/ Alyce (Dotty) Jane Oliphant Macaulay, b. 1859 m. Alexander Chivas, 1856-1893; Ref. A Double Scotch by F. Paul Pocult
4.John Drummond Macaulay, b. 1860; in 1929 there was mention of a person having this name being a bank agent in Norwood, Renfrewshire
4.Georgina Macaulay, b. 1862
4.Flora Alexander Macaulay, b. 1864 m. William Stewart Foggo
5.Nancy Macaulay Foggo m. Sir Thomas Andrew Montgomery-Cunninghame
4. James Oliphant Macaulay, b. 1866
4. Ronald Macaulay, b. 1867
3. Alexander Macaulay, b. 1814
3. Elizabeth Macaulay, b. 1816
3. Janet Macaulay, b. 1818
John Macaulay m. 2 Mary Smith and had further issue,
3.Maria Macaulay, b. 1823
3.Robert Macaulay, b. 1825
3.George Steele Macaulay, b. 1827
3.Joseph Dixon Macaulay, b. 1829
3.Catherine Anne Smith Macaulay, b. 1831
3.Isabella Carrick Macaulay, b. abt 1831
3.William Paterson Macaulay, b. 1833
3.Agnes Macaulay, b. 1835;
One researcher stated that John had an illegitimate son by Catherine Brown also named William.
2.Ann Macaulay, b. 1780 m. 1809 William Dunn Barclay, Writer in Glasgow; Sheriff's Procurator-Fiscal (Book: Old Reminiscences of Glasgow and the West of Scotland by Peter Mackenzie, 1890)
2.William Macaulay, b. 1782- 1856; customs officer, lived Troon; m. Janet Mckie and had,
3.Isabella Macaulay
3.Christian Macaulay
3.Janet Macaulay, b. 1818
3 Charlotte Macauley, b. abt. 1820
3.Louisa Macaulay (1827-1877)
3.Elizabeth, b. abt. 1829.
3. Catherine Macaulay (1818-1901) m. 1840 Alexander Paton (c. 1809-1882) coal and shipping agent, son of George Paton and Margaret Stevenson; Catherine and Alexander had five sons and two daus.
4. Margaret Stevenson Paton, youngest dau, m. 1881 the Rev. John Anderson, b. 1848, son of Andrew Anderson, farm overseer of Auchendennan and Margaret Weir.
5. Catherine Macaulay Anderson, b. 1887; m. Dr. William Towers Hardie (1878-1948), son of the Rev. Robert Montgomerie Hardie (1853-1942) and Mary Steel Smith, dau of William Smith.
5. Margaret Ethel Weir Anderson, b. 1888 m. James Macfadzean, B.Sc., M.I.C.E.
5. Lt. Gerald Alexander Paton Anderson, b. 1891
4. George Paton of Hillhead, Glasgow, possible son; not proven
4. William Macaulay Paton, Commissioner of Estates, another possible son; not yet proven
4.John Paton, b. 1856, Dundonaldy, Ayr (not proved)
4.Archibald Finnie Paton, b. 1858, same (not proved)
3.Elizabeth Macaulay
2. James Macaulay, b. 1784
2.Alexander Macaulay, b. 1786; married 1825 Agnes Fyfe, dau of Andrew Fyfe and Miss Williamson, the sister of James Williamson.
2.Susan Macaulay, b. 1788 - 1861, Edinburgh; unmarried; present at her death was her nephew, Henry Hawker Arnaud.
2.James Wardrop Macaulay, b. June 16, 1792.