Campbell Paterson timeline
30 July 1851: birth of Campbell Paterson Sr in Glasgow, parents Robert Paterson and Agnes Campbell
13 July 1853: birth of Mary Ann Drummond Davidson in Edinburgh, parents Henry Davidson and Margaret Dron
12 January 1872: marriage of Campbell Paterson to Mary Ann Davidson
23 April 1873: birth of daughter Maggie Paterson
19 April 1874: birth of daughter Agnes Campbell Paterson
14 June 1876: birth of son Robert Paterson
22 September 1877: birth of daughter Catherine Paterson
12 September 1879: birth of son James Davidson Paterson
3 April 1881: family in 1881 census at Brae Cottage, Pollok Road Eastwood, Renfrewshire
17 July 1883: birth of son Campbell Paterson
22 January 1885: birth of daughter Elizabeth Paterson
26 March 1890: birth of daughter Janet Finlay Paterson
5 April 1891: family in census at Viewfield, East Kilbride Lanarkshire (Mary Ann recorded as Catherine)
4 June 1891: birth of son William Watt Paterson
25 March 1892: birth of Sarah Cashmore in Belford, Northumberland, parents Samuel Cashmore and Emma Shaw
31 March 1901: family in census at Woodend House, Cathcart, Renfrewshire (Mary Ann recorded as Elizabeth)
27 March 1902: marriage of Robert Paterson to Maria Annie Calderwood and
27 March 1902: marriage of James Davidson Paterson to Eliza Margaret Calderwood
28 September 1907: marriage of Campbell Paterson Jr to Ann Brebner Simpson Davidson in Cathcart
2 April 1911: Campbell, Elizabeth, Janet and William, plus servants Sarah Cashmack, 19, born England and Mary Cashmack, 20, born Argyll, in census at Woodend, Newlands, Cathcart, Renfrewshire
23 December 1911: marriage of Elizabeth Paterson to Robert Paterson Crum in Glasgow
30 December 1917: marriage of Janet Finlay Paterson to John Brownlie Crum in Inverkip
1919: marriage of William Paterson to Margery Emma Sworder in Hitchin, Hertfordshire
9 September 1923: death of Mary Ann Davidson or Paterson in Skelmorlie
11 October 1923: marriage of Campbell Paterson Sr to Sarah Cashmore in St Helier, Jersey
12 August 1927: death of Campbell Paterson Sr in St Lawrence, Jersey
21 July 1931: death of Campbell Paterson Jr in Christchurch, New Zealand
4 August 1933: death of Robert Paterson in Maybole
26 March 1939: death of William Paterson in Glasgow
3 September 1947: death of Sarah Cashmore or Paterson in Glasgow
22 July 1949: death of James Davidson Paterson in East Kilbride
23 October 1968: death of Elizabeth Paterson or Crum in Burnley, Lancashire
3 January 1953: death of Agnes Campbell Paterson in Brodick
21 January 1973: death of Janet Finlay Paterson or Crum in Troon
Yes, the two Calderwood brides were sisters, and the two Crum bridegrooms were brothers.
The eagle-eyed will have spotted that I don't have marriages or deaths for daughters Maggie or Catherine, or a 1911 census sighting of Mary Ann Davidson or Paterson.