How about you: do you have brothers and sisters or are you an only child?
Do you get along with your siblings?
Do you think that your position in the family gives you certain character traits?
siblings - brothers and sisters
eldest - this is the same as oldest but only for people who are related (we can also use elder instead of older.)
get along with sb - have a good relationship with sb
traits - personal qualities or characteristics
Here's a nice video about things only siblings understand: