Turned the Tide with Pregnancy

My name is Emerald Peterson, and I have a twin brother named Kevin Peterson. Three days ago, Kevin was in a car accident and didn't survive. I hadn't even recovered from my grief when my parents trapped me in my room. Mom's eyes were red, but she gripped the black suit Kevin Peterson always wore, her voice trembling yet resolute. "Emerald, put this on. From now on, you are Kevin Peterson." I froze in place, thinking I must have heard wrong, shaking my head over and over. Dad came over and pressed his hand hard on my shoulder, the pressure painful. "This is the rule your grandfather left behind: only the eldest grandson can inherit the billions. Kevin is gone, so you have to take his place." I looked into their greedy eyes, feeling like a frozen dagger was stabbing my heart, but I didn't have the strength to fight back. That afternoon, I was forced to put on Kevin Peterson's suit. The person in the mirror looked unfamiliar and harsh; my short hair was neatly combed, and the oversized suit hung on me like a child sneaking into adult clothes. Mom stood beside me, coaching me on how to mimic Kevin's words and mannerisms. "Speak more quietly. Don't walk around all shy and girlish—Kevin Peterson never acted like that." I went through the motions mechanically, every action making me feel sick, but whenever I thought of my parents' disappointed and threatening looks, I could only grit my teeth and endure. A week later, the entire family gathered at the old family home, where Lawyer Carol Wesley was to read Grandpa's will. I sat in the seat meant for Kevin Peterson, my hands clenched tightly on my suit pants, my palms slick with sweat. Lawyer Wesley pushed up his glasses, opened the heavy will document, and his clear voice echoed through the living room. "I, Chandler Peterson, hereby voluntarily bequeath 51% of Peterson Group shares to my eldest grandson, Kevin Peterson." Hearing this, my parents' faces lit up with ecstatic joy, and they secretly gave me a knowing glance. But the next second, Lawyer Wesley's words froze everyone in place. "But the inheritance comes with two conditions. First, the eldest grandson must marry within three months." "Second, within a year after the wedding, he must produce an heir. Only if both conditions are fully met can the shares be officially inherited; otherwise, the shares will be divided among other family members." The living room instantly fell silent; my parents' smiles stiffened as they looked at Lawyer Wesley in disbelief. But inside me, a storm was raging—I had to marry in three months and then have a child?