Aitah for telling dad's wife that it is my house where he lives and she can't order me around

At just ten years old, he faced the shattering loss of his mother, a grief that would shape the course of his young life. Now nineteen and a finance student at the city’s top college, he carries the weight of his mother’s legacy—a house pa*sed down to him with his father’s quiet blessing, a silent promise amidst the turbulence of their shared past.

But life’s trials are far from over. His father’s fortunes crumbled during the pandemic, forcing the sale of a home once his own, while a new chapter unfolded with a remarriage and the arrival of a stepsister whose desire for connection is met with cold indifference. In this tangled web of family and obligation, he clings to the few true bonds that offer solace—his cousins, the sisters he chooses, standing as a steadfast refuge in a world of complicated ties.