How do an already started and very detailed family tree?

My dad has a very detailed family tree already started. I started my own account and I dodn't want to have to start my entire family tree over from scratch.
Answers
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You only need to add any living ancestors to your tree. Every thing else will be automatically be added to your tree.
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@Cora9528 As soon as you add a deceased ancestor (if he is already in the tree), FamilySearch will find his record and ask if this is the person. If you agree, everything from that person back will show up on your tree. 😊
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…and if your tree doesn't automatically find the closest deceased ancestor, ask your dad for the Identifier Number for that person, and add that person to your tree by ID Number.
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@Cora9528 You might like to consider using the Family Group functionality that FamilySearch has built in. There is information on this in the Help system, for example, here. This allows a group of users to share information on living people. For example, you or your dad could create a family group and invite the other to join it. You could also invite other members of your family (and possibly other people whom you trust) who have FamilySearch accounts to join your group. Then each user could add profiles for the living people on whom they have information that could reasonably be shared with all the users who are members of the group.
If you chose to go down this route, your dad could create profiles in the group for each of your living relatives for whom he has already created a private person profile. That is not as much work as you might think because FamilySearch has tools to copy information from a private person profile to a family group tree profile. Once he has done that, he could stop updating his private profiles (and possibly delete them, apart from his own profile), and concentrate on updating the family tree group profiles.
It is important that you respect the privacy of the people whose profiles you are sharing in a Family Group Tree and don't add information that breaches their privacy.
That's a brief description of Family Group Trees. For much, much more information, you can follow the link that I gave above and the various related articles that are referenced there.
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