Framed by the alpha's true daughter, my family regrets very much

Grandma sighed, waving them out. "Enough, let me have some peace. Everyone out, except Rona. I don't want to see anyone else today." Once they left, she turned to me with a reassuring smile. "Don't be afraid, Rona. I've already set up a will. You've grown up under my watch. I won't let you fall into the hands of people who would abuse you." My heart clenched as I looked at her frail face, and I nodded solemnly. Later that night, Theo came to pick me up again. Once in the car, he spoke coldly, "Jade's getting married. She wants you to help her pick a wedding ring tomorrow. Get ready." I froze for a moment. "Why me? Why would you want me to help her pick a ring? Our relationship doesn't even come close to that." "I promised I'd attend the wedding. As for the rest, it's non-negotiable. If you're unhappy..." Before I could respond, he interrupted. "You've taken Jade's life for so many years. What's wrong with helping her pick a ring?" "Rona, as long as you're in this family, you don't have the right to refuse." He rolled down the window, letting the cold wind rush in. "Time to wake up." Already suffering from a cold, Theo ordered the driver to speed up, pushing me further into discomfort. The cold air slapped against my face, making it hard to breathe. When we finally reached home, I was a mess, my body battered and chilled. But Theo's eyes showed no trace of sympathy. "This is the consequence of not listening. Remember, you're just a dog in this family. Whatever we tell you to do, you must obey." Inside, Jade was leaning on my mother's shoulder, acting sweet, asking for a ten thousand increase in her allowance. My father laughed, teasing her. "When you need money, tell me, but tell me who you love more, Daddy or Mommy?" I stood there awkwardly, an outsider. They barely acknowledged me when they saw me, just a casual nod. "Take the top floor storage. Jade doesn't have a room for her drawing tools, so we'll clear yours for her." "Fine. I'll do that." I retreated to my room, locked the door, and collapsed, too afraid to let the tears fall. As I forced myself to sleep, I felt someone's hand gently stroke my hair. It must have been my mother, right? But no, I immediately dismissed that thought. How could it be her? She was too busy pleasing Jade now to care about me. The next morning, Jade sent me a message. "Remember, you promised to come with me this afternoon to pick a marriage agency, right? Brother should have told you about it. Oh, and Alpha Sabastian will be there too." I clenched my fingers tightly, my breath growing heavier. I knew she was intentionally trying to humiliate me, but the current situation left me with no choice but to comply. Once I entered the living room, I casually picked at the leftover food they had abandoned. Just as I was about to retreat to my room, Jade called out to me. "Sis, you're really pitiful now, aren't you?" "now you can't even have a decent meal..."