Citing sources of information for each individual can become quite lengthy, something not easily accommodated by the preprinted forms. However, good source documentation is the mark of a great genealogist. Take care to include the name of the archive or library where the information was found, as well as call number or microfilm number. In the case of certified copies of vital records be sure to included the official file number. Genealogy management programs overcome the documentation problem by printing out variable sized family groups sheets for those ancestors with lengthy source listings.
Many beginners object to adding the information on the siblings of direct line ancestors.
However, it is widely accepted that when reviewing a family group sheet, many clues are unearthed by noting the birthplaces, etc of the other children in the family. One can begin to map a migration pattern for the parents, providing additional ecclesiastical and government jurisdictions to look for documents. Often aging parents are found in the household of a married child, hundreds of miles from their former hometown. Its also necessary to show the number of children to paint a clearer picture of each family unit's life and times. Many of us are humbled to see what large families our ancestors fostered.