Birthdates of family of Gulbrand/Guri Jonson Rogn

Can someone supply the birthdates of the six children of Gulbrand and Guri, of Vang? Their names were Randi (or should it be Rangdi?), Jorgen, Johan (Jon), Andres, Iver and Gulbrand. What would be the correct designation of their birthplace and childhood home? I've seen both Vang and Vestre Slidre used in this context. Vang has a point locus on a map; Vestre Slidre seems to be a region within Oppland (County?), but what should it be called? Andres (sometimes written Anders, or Ander) was my Great grandfather.