Filthy Rich has had his suspicions for some time about his wife acting secretive and strange. When he finds out that these worries are correct, him and his daughter are heart broken. Going through the divorce will be hard to manage, but he has another job to do at the moment. He's been called to Canterlot to assist with the next Gala. During their visit, Rich and Diamond find a silver lining they desperately needed.

Based on my own Next Gen verse

The Elements of Harmony haven't been needed in such a long time and still sit in their place at the Tree of Harmony. It's been many years since Equestria has been at peace. However, Queen Celestia and Luna have taken notice of things yet to come and have debated every option they could take. Tirek was brought up and Celestia decided that trying to reform him would be the best option they would have. The risk was heavy, but it was a risk they needed to take.

Based on my own Next Gen characters
Keep in mind this is how Celestia and Luna look like in this AU
Next Gen Queens