Each child usually thinks someone else is the favorite child. In my family, we are favored for different things.
Me,eldest.--i am the most consulted one and parents talk with me the most. But they also criticize me the most and I am the only child who does housework.
Sister, #2-Definitely not the favorite. I think this is why she thrives on attention from others. however, my dad is adoring her these days as she got her grad degree and got engaged to a Pakistani guy. He was afraid for a while that she will find a non Muslim. And it's funny, she gets the maximum benefits in the house like her own room, gets to hang out with friends, doesn't contribute any of her money to anything, because she demands it. So in this way, she definitely is favored.
Brother, #3-SOO SPOILED, he shares a debit card with my mom, never makes his bed, does his laundry, has never had a job, etc. he was the first son after 2 girls and 6 years of marriage which i appreciate, but since he's 19 now, i get annoyed to pick up his stuff.
Brother #4-the baby, he is spoiled in that my mom cooks him whatever he wants, whenever he wants. None of the other kids do this. he has never done housework in his life. But in other ways, he's not spoiled, because he has a job, rides his bike to school instead of bugging for a car, etc.
If I have kids, I will make sure I don't make the oldest my permanent assistant that always helps me but always gets all the criticism. And for the youngest, I want him or her to have actual capabilities instead of acting cutesy all the time...so I will give him more responsibilities even if my automatic tendency is to ask the eldest.