Olof Andersson and Maria Svensdotter, my great-great grandparents

Olof Andersson was born 1803 in Jung Parish and died 1846 in Hallum, both in Skaraborg County. His wife Maria Svensdotter was born 1806 in Hangsdala Parish and unknown when/where she died. I believe they had 3 children, Anders Gustaf, Johan and my great-grandmother Anna Britta Olofsdotter who was born 1836 in Hallum and died sometime after 1920 - unknown where she died.

Anna Britta married Nils Johansson October 1861 but unknown exactly where, and they had 6 children. My grandmother was Anna Sophia Nelson who was born May 1871 in Hallum, Skaraborg.

I need to have the information for the unknown dates and places and if you can add any information for this family it would be greatly appreciated.

Thank you for your time and trouble. Alice Haglund Scoggan