brothers of Sverre, buried in Mosjøen cemetery in Vefsn (Vefsen):
Egil Lund Kjønnås, born 23 Jan 1983 - died 12 Jul 1967
Olav Kjønnås, born 23 Jun 1896 - died 13 May 1966
Thorvald Kjønnås, born 15 Dec 1898 - died 10 May 1996
By the way, there are 51 people named "Kjønnås" listed in the Norwegian phone book. Most of them live in Mosjøen in Vefsen. Since there was only one family living at Kjønnås in 1910, and at least 3 of Sverre's brothers lived their entire lives in Vefsen, it is safe to assume that many of these people are your cousins.
If you are interested in getting in contact with them it might be easier than you think. Do you use Facebook? If you go on Facebook and search for "Kjønnås", you will find several people of this name living in Mosjøen, You could try sending them a message to see if they answer. If you don't use facebook, I could give you a hand with this.