I have no connection to family, only listing possibilities.
1930 Il/Will Co/Joliet Otto J. Dahlgren 45 Sw Sw Sw Moulder/Foundry Imm1895 (1st md at age 23) Ida 45 Il Sw Sw (1st md at age 23) Alverina 22 Il - Edven 18 Il - Tekla 16 Il - Madaline 14 Il - Edna 11 Il - Katherine 8 Il
1920 Il/Will Co/Joliet Otto Dahlgren 37 Sw Sw Sw Moulder/Stone work Ida 37 Il Sw Sw Elvira 11 Il - Edwin 9 Il - Tekla 7 Il - Madaline 3y?m Il
1910 Il/Will Co/Wilmington John O. Dahlgren 25 Sw Sw Sw Farmer Imm1895 Ida ?. Il Sw Sw Elveria A. 1 Il - Anna C.(mother)(widow) 69 Sw Sw Sw (1895) John & Ida md 2yrs. Ida had 1 child/1 living. Anna C. had 8 children/3 living.
The 1900 Census was too hard to read but Anna is HOH with John living there and someone named Johnson. Anna was b.3/1841 and John 12/1883
In 1920 Anna was living with widowed son-in-law Andrew J. Bjork. In 1910 widowed Andrew J. Bjork has a sis-in-law living with him Hennie M. Dahlgren(b.abt 1890Sw)(Imm 1895) and next door is a Anton O. Dahlgren(b.abt 1888Sw)(Imm 1895).
Andrew J. Bjork md Helena C. Dalgren 7/31/1897 Will Co Helena was b.6/1871 and obv d.bef 1910
There is a Anna Charlotte Dahlgren who died in Will Co 11/18/1929