I wonder...Can a character get married with a woman who owns a title????for exaple a countess..i propose marriage to one but she never accepts....
I think they're just married and both rule their own realms, the marriage doesn't affect their lieges or vassals in any way.
Unless I want her as a steward/spymaster/chanceller, I always give my current rulers mother land, since under primogeniture/consanguinity i'll always inherit it when she dies. This also works for wives, but that can be a problem if she dies before you get sons to inherit her (her titles will most likely go to her brother under consanguinity/primogeniture).
Under consanguinity you will not always inherit your mother's land, f.e. if your ruler dies before his mother then he other children will be first in line to inherit here, and not your children.
More likely with Consang you'll make your best son heir. If he's the eldest he'll inherit from his mother. If he's not, or he's a bastard, you're basically giving a bunch of free land to your loser-eldest.
The advantage of Primo in CK is that it's predictable, and tricks like giving your wife land and then getting it back always work.
Nick
To be honest I can't recall a single time when a ruler (female or male) accepted one of my offers for marriage. So it must be very rare indeed.