Thea will be born in 2044 and will be adopted by Alex Gray when she is around 18 months old. He will also adopt Delilah Gray at around the same time, and because of this and their similar ages, the two girls will regard each other as adoptive twins. Thea will be the youngest girl adopted by Alex, but after several more years, he will go on to adopt a final son, Jeff Gray. Her older sister, Chantelle, will manifest her ability of Enchanted Voice when she will tell Thea to stop crying.