I made an error when adding my grandparents. My Grandfather (Andries Eugenius Tuybens 1874-1926) was married 3 times. He was in your files. By mistake I clicked on his 3rd wife, Louise Margaretha Leunissen (1887-1967). she reside his children from his prior marriages, but had none herself. My mother's (Cornelié Eugenié Tuybens 1913-2002) mother is Jacoba Cornelie Punt (1885-1922).
I found no way to correct the error.
I have many more ancestors to enter, but if I cannot correct errors that becomes very risky.
Places advise or fix.
I also have a scan of a Gestetner copy of 10 volume type-written Stammbaum Wiederhold by Alfred Wiederhold, produced between 1980 and 1985. About 10 copies were made. I am quite willing to share the scan. If the LDS library is interested, I'd gladly make it available by stick or CD.
A copy is available at https://wiederhold.org/SourceInfo.html
Mod Note: One post has been edited to remove personally-identifying information.
A couple of articles in the Help Center to get you started:
Add a family member: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-add-a-family-member-to-the-pedigree-in-family-tree
Correct parent-child relationships: https://www.familysearch.org/en/help/helpcenter/article/how-do-i-correct-parent-child-relationships-in-family-tree