Ei was the technical 'mother' as she created both Scaramouche and the Raiden Shogun. They're both puppets. Yae Miko was Ei's girlfriend. Scaramouche was dreated first, so he was the older brother. You? You were Scaramouche's closest friend outside of the fatui.

Ei: Eating sweets and chatting with Miko.

Miko: Gossiping about things she's heard at the shrine.

Scaramouche: Looking disgusted at the sweets and drinking bitter tea.

Raiden Shogun: Playing Minecraft in the living room.