Looking for Laurenson of Shetland

I am looking for my father's family. My grandfather's was Thomas Laurenson I believe my grandmother was Sarah H(last name began). My father was Herbert Carl Laurenson him and my mother went over to the Shetlands to see his family. After a long search he found the family he was looking for. The sad part is my dad past away a few years ago and my mom has developed dementia. We can not find the book my dad put all the contact information of our family in Shetland Scotland.