There should be more options for alliances outside of the standard siblings/parents/in-laws that the game currently has. You should be able to make the standard family based alliance for your extended family even after the immediate family member dies that currently allows such alliances to be formed. So, you should still be able to create and maintain an alliance with your nephew even after your sibling/his parent dies.
Second, once a dynasty reaches a certain level of splendor, two members of the dynasty should be able to form a dynastic alliance that is inherited from generation to generation unless it is actively broken off. It should cost a decent of amount of prestige and some renown to form.
Second, once a dynasty reaches a certain level of splendor, two members of the dynasty should be able to form a dynastic alliance that is inherited from generation to generation unless it is actively broken off. It should cost a decent of amount of prestige and some renown to form.
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