Since you said you had your father in your tree twice, bring up the other instance(unless you deleted both) and add him as a child to his parents. That will reconnect him to his family.I you did delete both duplicates, you will just enter him again as a child with his parents. You might have to do some repair work but not on the scale you are worried about. Also, should you find other instances of duplicates in your tree, do not delete them. Simply select "more options" which is last of the 5 options below the persons name in your tree overview page. Click that and choose "merge with duplicate". Then make sure that both duplicates have the same exact information. Follow the steps and your duplicates will be merged into one without losing anything. It is great that this has at least been added to the member tree program.