I am having trouble understanding the matrilineal marriage dynamic in Crusader Kings 2. A couple of times, I've had a female member of my dynasty marry someone matrilinearly who has then ascended to, say Baron or King. The problem is, they have had children, and the children, who are then heirs, have been of the (more powerful) father's dynasty.
I was under the impression that all children born of a matrilineal marriage would be of my dynasty, hence why I married my daughters off to powerful husbands in the first place! I must be missing something, so how does this mechanic work?