Yes, you can call your brother "darling" as a term of endearment. It depends on your relationship and the context; some people use affectionate terms like this to express warmth and closeness. Just ensure that your brother is comfortable with such terms, as preferences can vary.
The cast of Just Call Me Darling - 2013 includes: Diamond Owens as Martha Darling Michael Sibila as Scott Darling
You still call your brother, your brother.
Darling EXP: Your so darling ..
You would call your husband's younger brother a brother-in-law.
Your son will be a nephew to your brother, and will call him "Uncle".
what i call my father elder brother's wife
Brother
Brother
You can call your elder brother as 'ANNA' and your younger brother as 'THAMBI'
Would you call your brother god?
The relationship of the sibling of your sister-in-law or brother-in-law to you does not have a name in English. You could call them your brother- or sister-in-law if you want, or you can call them the brother or sister of your brother- or sister-in-law.
You call your husband's senior brother simply a brother in-law. There is no difference whether he is a senior brother or a younger brother he remains your brother in-law.