Miles married Margaret Thirnbeck on 23 May 1774 in Middleton, Kirkby Lonsdale, Westmorland, England. Margaret (daughter of Christopher Thirnbeck and Elizabeth Whittington) was born about 1746 in Middleton, Kirkby Lonsdale, Westmorland, England; was christened on 6 Mar 1745/46 in Middleton, Kirkby Lonsdale, Westmorland, England; and died. [Group Sheet]

1. John Brockbank was born on 1 Oct 1776 in Sedbergh, Yorkshire West Riding, England; was christened on 5 Jan 1777 in St Andrew's Church, Sedbergh, Yorkshire West Riding, England; and died.
2. Elizabeth Brockbank was born on 17 Mar 1778 in Sedbergh, Yorkshire West Riding, England; was christened on 19 Apr 1778 in St Andrew's Church, Sedbergh, Yorkshire West Riding, England; and died.
3. Christopher Brockbank was born on 20 May 1780 in Sedbergh, Yorkshire West Riding, England; was christened on 27 May 1781 in St Mary's Church, Dalton in Furness, Lancashire, England; died on 12 Nov 1858 in Sun Street, Ulverston, Lancashire, England; was buried on 16 Nov 1858 in St Mary's Church, Ulverston, Lancashire, England.
4. Mary Brockbank was born in 1783 in Pennington, Lancashire, England; died on 26 Apr 1860 in Burlington Street, Ulverston, Lancashire, England; was buried on 29 Apr 1860 in St Mary's Church, Ulverston, Lancashire, England.
5. Miles Brockbank was born in 1785 in Over Wyresdale, Lancashire, England; was christened on 20 Mar 1785 in Christ Church, Over Wyresdale, Lancashire, England; died on 24 Mar 1820; was buried on 24 Mar 1820 in St Mary's Church, Ulverston, Lancashire, England.
6. Robert Brockbank was born on 25 Jun 1787 in Sedbergh, Yorkshire West Riding, England; was christened on 15 Jul 1787 in St Andrew's Church, Sedbergh, Yorkshire West Riding, England; died in 1806 in Lancashire, England; was buried on 5 Feb 1806 in Lancashire, England.