You are not related at all by blood and you not related by marriage as you were already born when two family,s become togeather by marriage .
But if or when you have kids they are related to him by marriage and they can consider him a grand uncle by marriage.
So you can sitll think of him as family if you what to and if you are in same family circle .
But if you not in same family circle and if you hardly ever or if ever see him at family functions , then he just someone that you dont know very well and is related to you sister by marriage.
sister in law
Your fathers sister or fathers brothers female partner.
Yes
fathers elder brother ANSWER: your sister in law........
sister friend
Cousins
fathers
Aunty and Uncle.
Aunt
Her father, unless the son and his sister have different fathers which would make him nothing to his son's sister.
your second cousin
philapple Uncle