Equal love for each child

So, the thing is that we're three siblings. I'm the middle one, my elder brother and a younger too. Me nd my bog bro has 4 yrs difference nd difference between my younger one and me is 7 yrs. I am not saying that my mom dad doesn't love me but they do not love me the way they love my both brothers. Anyone can see clearly that my younger brother is my dad's favourite and big bro is mother's. My big bro is 23 now, still didn't get a job after attempting so many competitive exams, he goes to a private school to teach since April. I've passed 12th last yr nd attempted a competitive exams this yr for the first time in my life but i couldn't pass this due to lack of 4 marks. This was it, my parents started doubting me that I was not studying properly like my brother does. I accept that I don't study much but I am so sure that I will pass the same exam next time because I got gud score this time too than my brother ever did. He does not even tell them about his result, his marks or how he did the paper I mean gud or bad. But still he is most favorite, more talented than me even when I do almost all the house chores daily. I mean I've spinal problem, so i can not do much work like everyone but I do or I should say that it's my helplessness that I have to do this. Like today, i could not wake up early in morning so my mother had to cook food and she made chapati, and when my father was done with his worship i was awake that time and he started taunting me that i never do any work any chore, I can not do this, do that nd he just forgkr that I am the one who makes chapati daily morning nd evening, I cook rice every noon, washing dishes, cleaning the kitchen and a many too. All he sees is what I was doing now and he saw nothing because I had not helped my mother today. My hands get number when I do these chores, I even told my mother abt this but she still didn't take stand for me when my father was scolding me but I don't care anymore. I've learnt that I can never be enough for them and become their favourite so i just do what I need to