Per,
Thanks to the crucial information you provided, I believe I have found Carl Grahn in the US. There are only 6 Carl Grahns in the April 1910 census. Only 3 were born in Sweden. One of them is a Carl W. Grahn (Wilhelm). His age is listed as 47, which matches perefectly for someone born in early 1863. He emigrated in 1888, settled in Essex Co, Mass, married Hilda in 1890, and had 4 children. I also found him in the 1930 census. He was 67 then but listed his occupation as an odd man in the LEATHER industry. Next I'll look for his emigration record out of Sweden, or a naturalization document in the US.
Incidently, can you obtain the death dates for August Widerstrom and Cajsa Brita Grahn?
Thanks,
Andrew