I'd just answered part of this here:
http://www.twcenter.net/forums/showt...41#post1432841

person I was answering there already had person on the map, that's not a bad way to start, make your new person a general first ie.
character Nakhrankh, general, age 20, , x 187, y 2

army
unit egyptian archer exp 0 armour 0 weapon_lvl 0
The name of the character must be a male character name for the correct faction (you can view listing in data/descr_names.txt) if you want to put him in the family tree later it should also be a name that no one else in the faction is using.

the x and y co-ordinates are where he will appear on the map, open rome shell in the game (normally ` key), and type show_cursorstat to find co-ordinate of a valid location (that gives the position your mouse is hovering over). General must have at least one army unit to act as his bodyguard.

If that works to get him into family you then have to make him a named character instead of a general and add him to the relative section at the bottom of the faction listing. He has to fit into a logical family structure as father / son etc. See the link at top for my attempt to explain that.

Oh and make sure you are using -show_err that can give you a useful error message.