Rightful Heir

The current rightful heir of any character is the character that meets the qualifications below who is also not disqualified:
 * 1) Oldest son
 * 2) Oldest male sibling
 * 3) Oldest nephew
 * 4) Father
 * 5) Uncle (father side only)
 * 6) Oldest daughter
 * 7) Oldest female sibling
 * 8) Oldest niece
 * 9) Mother
 * 10) Aunt (father side only)
 * 11) Liege
 * 12) Emperor

Disqualifications
If a character has any of the following traits they are disqualified from the line of succession: Also, obviously, dead characters cannot inherit although may be used in the line of succession. Finally, if there is no rightful heir the title and the assets associated with it are removed from play.
 * Exiled
 * Heretic
 * Bastard