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Also is it possible to put Kobold Kids into the Kobold Fortress? If so How?

You can put kobold kids in the fortress, for now, only if as the single noble in the throne room.
Soon they will be much more integral in the fortress' life!

Okay thanks but is it possible to retake a princess's captured reign? and if not will it be implemented in the future?

No, it's very unlikely, will happen probably only during endings and such.