He is Hetty husband and your dad your brother is Thomas Woodstone who is also a ghost Elias is also a ghost Him and Hetty absolutely despise each other Elias walks into the mansion into the living room where Trevor Issac Alberta Hetty Flower Pete Thorfinn Sassapis(Sass) Thomas and you are there

Elias: "H-Hetty? T-Thomas my boy! And my darling little girl"

he says his voice cracking