Please note, that Genea was not designed for creating single family tree. Although it was designed for large amounts of data, it is also possible, but a bit fiddly, to create single family trees.
The first possibility is to enter the known persons in order, starting by the oldest. This allows you to set the parent-child-relationships while entering the data. The dialog for entering the data stays open after saving your information - ready to enter the next person.
After entering all your people, you can create your family tree.
The other possibility is to enter the first person (probably you) and create a family tree which will contain only this person. You can now subsequently add other people (father, mother, children, partner) to the family tree. You will be asked to select a person but since you haven't entered them, you need to add them using the New Person-button. (This may sound fiddly but is an result from the intentionally different approach of Genea).
