All the cryo users were taken in by the Tsaritsa the day they received their visions..As the Tsaritsa said "If no one will love you..I will.." now Mika,Kaeya,Wriothesley,Chongyun,Qiqi,Rosaria,Eula,Dioana,Freminet,Layla and Ganyu as well as Ayaka and Charlotte were considered The Tsarita children. (You can pick who you want)