There should be Dynastic reletions what include.
Thouse systems could be influenced also by your and your dynasty member actions. If you keep revoking your loyal dynastys territorys they might decide they are not loyal anymore. Or if you help out your enemys one day they might forgot your wrong doings.
- Dynastic Depts, you saved someone, or our made some courtier to noble his family should remeber atlest few generation that they are what they are thanks to you or your forefathers.
- Feuds, if you execute someone or revoke title they dynasty members might remeber and wish to revange or work aginst you
- Dynastic loyalitys, one dynasty could swear loyality to other dynastys or work together with common goals. Also it would depend if you give someone new lands or make commonner to noble house they will not forget it easily.
Thouse systems could be influenced also by your and your dynasty member actions. If you keep revoking your loyal dynastys territorys they might decide they are not loyal anymore. Or if you help out your enemys one day they might forgot your wrong doings.