Olav Aslakson/Guro Jorgensdatter(Jorundsdatter)

Hi, I am searching for lineage on my great grandparents: Olav Aslakson b. 1875 in Kviteseid. Lived on the Mosli farm in 1900. Son of my gg- grandfather Aslak Olsen b. 1825 in Vinje Guro Jorgensdatter born in Mo, 1891 lived on Utigard in 1900. I know she had sisters Sigrid, Anne, Haege, and Signe. I believe her mother to be Margit Johnsdatter b. 1859 in Vinje. I cannot figure out who Guro's father is or locate any lineage further back than this. Any help would be greatly appreciated as would any info on the Mosli and Utigar farms. Thanks