Wrong Turn

I got a bit excited. I was going through my computer files with all the genealogical data trying to organize them when I came across some documents. One was a death certificate for James Nathan Jeffrey giving his father as Jessie Jeffrey and mother as Mary Franks. The informant was his son, John T. Jeffrey. Also there was the funeral record, with the same informant.
I was excited because I've been trying to discover if there is a link between the Franks that were in Caldwell county around 1822 and my g-great grandmother, Minerva M. Franks (1823-1903) in Huntsville, TX. I haven't been able to find any information on her as to who her parents were.
The problem was, I couldn't find the Jessie referred to as Mary's husband. There was a Jesse who was the brother to Jeremiah Jeffrey, Minerva's husband, but nothing matched up.
Slowly it started to make sense. The informants on the two documents were the same person, James Nathan Jeffrey's son. I've discovered that informants on death certificates are wildly unreliable. Whether from grief of the moment or just not really knowing, they almost always give the wrong information somewhere. And I seem to recall, in the distant past, going through this same excitement, only to realize that James Nathan's father was Jeremiah Jeffrey and his mother "Mary" was actually Minerva M. Franks. Back to square one.