It happened historically, so why not? Wu Zetian, female emperor of China, for example, took the throne after the death of her son. Catherine the Great won the throne after leading a coup against her husband, as well. A high-stat consort should thus be able to take control from his/her spouse or heir (especially if they have low stats), giving a hit to stability and severely hurting Legitimacy. These would be two separate events- one which kills the heir and makes the Consort the ruler (as was Wu Zetian's case), and one where the ruler dies and the heir remains in place if there is one (as was Catherine's case).
Upvote
0