@Brita Christina Backman/Kalen (Sjostrom). From Family Search, https://www.familysearch.org. Her children.
Brita Sjostrom (born 1782) and Jonas Backman (born 06 Feb 1776 Uusikaarlepyy, Vaasa, Finland, died 18 Oct 1814)
Their children:
Anders Bäckman, born 02 Dec 1800
Erik Bäckman, born 17 May 1803
Jonas Bäckman, born 11 Mar 1806
Anna Charlotta Bäckman, born 17 Dec 1808
Christina Ulrika Bäckman, born 28 Nov 1811
Johan Hendrik Bäckman, born 19 Feb 1815
Brita Christina Backman had Margaretha Christina Backman on 30 Nov 1820.
Brita Christina Backman and Michael Kalin had a son called Michael Engelbreckt Kalin, born 21 Jan 1825.
The surname Kalen can also be spelt Kalin.