Source type tag: Primary, Secondary, Terciary in the Person's Page & Source Box.
It's a good idea to create a separate listed field (no images, just text as it is) for a quick clickable visualization of Primary, Secondary, Tertiary already indexed records type under the person's page Sources tab.
Eg.: John has 100 records on your Sources tab. But John has only 4 main primary records: Baptism, Birth Record, Wedding and Death Record.
The others 96 records are from John's descendents. Some Secondary sources mentioning him as a Father or Grandfather. And some Tertiary sources mentioning him as godfather, witness in some events or even on a newspaper article.
So we don't need waste time searching all over indexed sources. After properly tagged by the user who has associated the record. In this way we have under Sources' tab a field in the upper screen with the most importants records, following by secondary and tertiary records.