It's right in the title: this is "Georgie and Mandy's First Marriage." And the latest episode provides the clearest signs yet ...

Sheldon, Georgie, and Missy lived together under the same roof, but their relationships with one another were far from uncomplicated.

Georgie & Mandy's First Marriage is a spin-off based on Young Sheldon and continues the narrative focusing on the relationship between the two titular characters, Georgie and Mandy.