could the faction system be changed like this?

[unmerged(196685)]

My English is poor.
could the faction system be changed like this?
Add opponents in the faction.These opponents will weaken the of the faction!

For example,a faction(younger son for the King) is established.
The elder son ( a duchy) ,of course,do not want to see this situation and then he join the opponents.
If the leader started a civil war,he will declare war at the king and the elder son at the same time.

My English is poor!!

 

[postm00v]

There has been talk about the need of a 'Loyalist' trait, which is basicly what you're describing (I think)