Being the eldest son/ daughter in my family, I also have a younger sister. My parents' favoritism towards my sister is obvious, and when I'm at home I always hear them calling to shush her and concern themselves with her daily routine. But I've been living out of town myself for a month now, and I've never received even a single greeting call.
I can't even stand to see my close friends and family happily talking on the phone because that kind of envy makes me sour inside and depressed.
There are so many little things that accumulate in the family, and every time I look back, there's always a voice that says: they're the family, and I'm like a bloodied outsider, just an outsider tied to the inheritance.
Since I was a child, my family always asked me to give in to my sister in everything, but no one asked me how I felt. I can't even take care of myself, just like Fu Seoul said, I only have one candy, why should I be forced to share it generously.
Hi, I'm strawberry, first a warm hug for you.

💫 Also as children, my parents clearly favor my sister more. When I was at home I always heard them calling to care about my sister's well-being, while I myself hadn't received a call in a month when I was away. The contrast makes me envious and heartbroken, and my emotions fluctuate more easily when I see other people talking to their families intimately.
☀️ What is the age difference between you and your sister? At home, I heard my parents often call my sister, which means that they can see your daily life, know your living conditions, eating and living with care, do not have to worry about you running around outside. Sister in the field, parents more concerned about is normal, after all, the child is not around, always worried about eating bad wear not warm, this is human nature.
🌸 But when you're out on your own for over a month and your parents don't even call, the disparity makes me think deeply. Why are they so attached to their sister when they are also their own children? Even if they were more comfortable with you, they shouldn't not have a single greeting.
🌸 I remember watching a drama clip about a family with two siblings, where the parents favored the older sister more and the younger brother had no say like an outsider. The older sister gets whatever she wants, which may seem funny, but it actually reflects coddling and victimization. This environment tends to make the older sister vulnerable and egotistical, while the younger brother has low self-esteem and is introverted, and may grow up to be a pleasing personality.
🌸 From the text I can't guess your exact relationship with your parents or your personality. But in general, parents probably prefer well-behaved and understanding children.
💫 Growing up, why was I always asked to think about my sister, but no one took my feelings into account? I'm too busy for my own good, it's like the old saying, I only have one piece of candy, why should I be asked to share it.
🌸 Your parents' differential treatment has alienated you from your sister, and you may not even see the good in her. But the question is, is this favoritism caused by your sister? Has she ever badmouthed you in front of your parents? Or use words of sarcasm against you? If she didn't do that, try to adjust your mindset that she is your sister, not an enemy. You are both independent individuals, there is no need to compare all the time.
🌸 Have you tried communicating with your parents when they treat you so differently? Communication is the key to solving problems. Without speaking up, the situation will only continue. Letting your parents know what you're thinking and seeing how they respond can help you clear your head.