Lena Wiedman married John Dutill in 1900 (same database).
The 1910 census shows Harry and Minnie in Philadelphia. It indicates she immigrated ca 1884. The 1920 census shows Harry as a widower and under the misindexing of Waedmar. The 1930 census shows Harry with new wife Lyda. Living with them is son-in-law Edridge (Eldridge no doubt) Schensky. The 1920 census shows Eldridge was the son of William who immigrated in 1883 of Washington Co., MD. William's World War I draft card shows he was born April 6, 1877.
Harry's World War I draft card shows he was born Oct 11, 1879 and his wife Minnie is listed on the card. George's draft card shows he was born Aug 21, 1880.
Some of these records you can look at for free at labs.familysearch.org and Ancestry.com. For those you cannot see for free I suggest checking with your local libraries to see if they have Ancestry or Heritage Quest.
The Philadelphia Free Library might be able to find a 1902 obituary for Lena. With luck they can find one for Harry Sr. If Harry Sr had died when his children were young guardians may have been appointed for his children. The Philadelphia County Register of Wills might have that in their Orphans Court records. The Northwood Cemetery might have some helpful data in their burial records especially if Harry was buried in the same plot with Lena. Anyone of Lena's children obits or death certificates should indicate her maiden name.
Harry and Minnie's marriage record may have data on their parents. Lena and John's might be helpful too. The Register of Wills should have the records. Minnie's obit and death certificate should both prove very helpful. She seems to have died between 1917 and 1920.
Check with the Historical Society of Pennsylvania and perhaps the Philadelphia Family History Center to see if they can help you. The Philadelphia City Archives may have useful data: http://www.phila.gov/Records/Archives/Archives.htmlhttp://www.phila.gov/Records/Archives/Archives.html