Jonsson, Mathias and Jonas (Stolt also)

[Jenny Ann Blomberg]

I have been searching for my great great grandfather.  His name is Mathias J Blomberg (born 14 i 7 1867 in Jamtland) This is the only information I have for him.  (I am told he changed his name to Blomberg upon emmigration.)  It was originally thought that his last name was 'Jensen' but someone down the line (who has now passed away) says it was Matson.  The Matson name I can find nothing for that fits.  (See below.)
 
His brother went by the name of Jack, but one of his granddaughters wondered if his name was John.  He was born in 1871 or 1879.  For Jack I have a birth date of 10-21.  
 
If you know any information regarding the above brothers, I would very much appreciate it.
 
I found the following information on this site and am wondering if it is the brothers I am searching for:
http://www.foark.umu.se/census/z/personal.asp?lannr=23&forsnr=67&pnr=4362
 
Anders Mathias Jonsson b. 1867, gårdseg.
Jonas Jonsson b. 1871
 
Matt married Gertrud Stolt (b. 1878 Bracke, Jamtland, Sweden) and Jack married Hilma Ross.  Any information on any of my family would be greatly appreciated [(Stolt or Matt and Jack](including locating relatives in Sweden).  I have some postcards from Sweden as well.
 
Thank you in advance for any assistance you may be able to provide.