You can refer to your second elder sister as "my second sister" or "my second eldest sister." Alternatively, you can use her name or a nickname if you have one. In some cultures, terms like "sister" or "sis" can be used affectionately regardless of age order.
In Tamil, elder sister is called "அக்கா" (Akka).
akka .. for elder thangai for younger
Your brother's wife is your sister-in-law.
sister in law
noona for elder sister 누나- that is how you right it
While generally referred to as a Sister-in-law, there is no relationship.
Sister-in-Law
sister in law
Sister In law
In Malayalam, 'sister' means 'Sahodhari'. (Chechy = elder sister, Anujathy = younger sister)
just call her by her first name, she is no relation to you.
He will be called ' massi ka beta' or one can simply call cousin.