It's very simple, it's a marriage, in order to consolidate the rule and appease the northern border, and once you have a child, you can justifiably support the puppet, and the other heirs, whoever threatens, will be killed directly. This political skill is only two or three of ten in the Spring and Autumn Period and the Warring States Period. As far as I can see, this reason is quite straightforward, and there is nothing to hide. As for the influence of the biological mother, you can directly find a stepmother or a nurse.
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