Aunt
In Telugu, you can call dad's sister "peddamma" (పెద్దమ్మ).
cousin
My Dad's Tapes - 2011 Call with My Sister 1-13 was released on: USA: 10 September 2011
That would be a half sister, but for family unity just call her your sister & treat her like one.
In Sanskrit, your dad's sister is called "Maternal Aunt" which is translated as "मातुलानि" (mātulāni).
In Punjabi, your dad's sister's husband is called "ਜੀਜਾ" (jija). This term is commonly used to refer to the brother-in-law of your father.
dad's sister = maami, auntie (മാമി, ആന്റി) sister's husband = aliyan (അളിയ൯)
In Punjabi, your dad's sister is called "Bua" (ਬੂਆ). This term specifically refers to the paternal aunt, distinguishing her from the maternal aunt, who is called "Mausi" (ਮੌਸੀ).
phone a friend. call a teacher, call the school, call your mom/dad/sister/brother
If you have a sister with the same dad but different mom, then she's probably your half-sister, although she would have about 25% of the same DNA as yours.
Your dad's sister in law that is your mother's real sister.
sister : sagodhari சகோதரிelder sister: akka அக்காyounger sister: thangachchi தங்கச்சி