how do i sync my family tree with my wifes tree

Hi Traditionally, this is done by adding your wife and any of her living ancestors. You have to enter these on your account, and they will have a separate ID from what is showing on your wife's account. Once you get to her deceased ancestors, you can add them using the same ID as shown on your wife's account. When you do this, all her genealogy from there on back will be shown.

There is a new feature of Family Search called Family Group Trees. This allows you to form a family group and share the profiles of living people. Here is a link giving more information on this feature. There are some additional links in the article for additional information.