Ambrose Pelham Jordan his a full sibling to Elizabeth, Jane, David M., John Daniel, James Pinckney, Missouri, Susan Jordan and a half-brother to Nathan John Jordan and Thomas Clayton Jordan. His mother was Mary Elizabeth Pelham, dau of James Ambrose Pelham and Lydia Kirkland. After the death of Ambrose Pelham, Lydia Kirland Pelham married James Thurston and had son, George Thurston. She and George are buried in Henry County, Georgia.
I do not know how to correct the half sibling to full sibling in Geni and I invite anyone with knowledge of doing so, to correct the error.
I can't see your tree but I take it that some people who should be shown as full siblings are instead shown has having one or the other parent not the same - thus half siblings.
This could be due to more than one issues. Sometimes trees get merged and a parent appears twice with the same name but two different records.
Or a child could have a parent that is incorrect - not really their parent but someone made a mistake.
In this latter case, try deleting the parent.
In the former case try moving - move one to the other and mark them the same person. When you are looking at a record on the tree you can see the word "more" - drop down the menu and pick move. Then find the other person and drag and drop the original person on to the second person. Then it will ask you their relationship and you can pick the option that they are the same person.
to invite someone to join your family group, go to their profile (by clicking on their name next to the comment, for example). Now click the Options button on the top-right, and then click Add to Family Group. Modify the message, if you like, and click the Send button. Once Douglas receives this invitation and accepts it, you'll be all set.