To make sure you are on the right track I suggest getting Andrew's death certificate and obituary. The former you can get directly from the PA Div. of Vital Records. The Johnstown Area Genealogical and Historical Society and possibly the Cambria County Library in Johnstown may be able to help you with the latter.
You could also try to get his marriage record which judging by the 1930 census would have been ca 1926. It is probably on record at the Cambria County Register of Wills and should have info on the parents (assuming they get the license in Cambria County).
Once you know with certainty of who his parents were then work on getting the death certificates and obituaries for his parents. They are quite possibly buried in the same cemetery as Andrew. The church they were members of may have info on them.
The 1900 census shows Andrew was born May 1860, Mary Dec 1859, Rose Dec 1886, Andrew April 1891, Charles April 1893, Mary Aug 1895, Edward May 1898. It also shows Edward and Mary were married 14 years and immigrated in 1885. This same couple, I believe, appears in the 1930 census and claim to have immigrated in 1890.
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.