Which one is correct?
How is your parents?
How are your parents?
how are your parents
How is your mother? How is your father? is is singular, just for one
Are, applies to any plural and You, or I
How are you?
I am correct, aren’t I?
“aren’t I” is an anomaly; we don’t say “I are”. Many Scots use “amn’t I” which sounds odd but is more logical.