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Ok... yes there is a census record that shows Stanley as David's son. 1850 Census, Family # 115, Maindencreek Twp., Berks County, PA. Name spelled Coller. Shows David 44, Hannah 44, Solomon 18, John 16, Stanley 16, Mary 11, Hannah 8, Dianna 5 and Lydia 3. I show that John and Stanley are NOT twins, but that John was born 15 Oct 1833 and Stanley born 26 Nov 1835.
I also have David's parents as Johannes "John" Koller b: 12 Feb 1775 d: 27 May 1851 and Maria Barbara Glaser b: 24 May 1774 d: 14 Sep 1846. I have these dates from 2 sources. Their headstones in the St Peter's UCC church on the hill in Moselem (twin churchs with Becker's St. Peter's Lutheran church) and from a book of baptisms, deaths, etc. from the church. In that book it also shows David's baptism on 01 Sep 1804. Surname is indicated as Kollert. Sponsors: Peter Glaser and Catharina. May be a brother or father of Maria Barbara. (I am betting on brother.) I show no other baptisms for children from Maria and Johannes in that book/church. To date I have found no other records that show children for this couple.
Johannes died in 1851 but I am still searching for him in the 1850 census without any luck to date.