For the husband of your sister:
* അളിയൻ (aliyan): This is the most common term and is used for the husband of your sister.
For the brother of your spouse:
* ഭർത്താവിന്റെ സഹോദരൻ (bharthaavinte sahaadharan): This literally translates to "brother of the husband".
* ഭാര്യയുടെ സഹോദരൻ (bhaaryayude sahaadharan): This translates to "brother of the wife".
For the brother of your sibling's spouse:
* സഹോദരിയുടെ ഭർത്താവിന്റെ സഹോദരൻ (sahodariyude bharthaavinte sahaadharan): This translates to "brother of the husband of your sister".
* സഹോദരന്റെ ഭാര്യയുടെ സഹോദരൻ (sahodaranta bhaaryayude sahaadharan): This translates to "brother of the wife of your brother".
The choice of term depends on the specific relationship and the context.