You could call him by his name, or more generally as your 'brother in law'
sisters in law
She is your sister-in-law.
Brother-in-law.
your brother-in-law :)
Your sister-in-law.
Phillipp uncle
There is no specific word for the husband of your wife's sister. If you need a phrase, call him your "sister-in-law's husband."
Jijaji- brother in law
Lamont Perdy
Call her by her name.
Your sister's husband is your children's uncle. They are his nieces and nephews.
dad's sister = maami, auntie (മാമി, ആന്റി) sister's husband = aliyan (അളിയ൯)