How would one differentiate between brothers and siblings? For example if I have two brothers and one sister, is there a different word to indicate if im talking only about my brothers?
No. You know by the context or follow-up questions.
Eu tenho dois irmãos e uma irmã. Os meus irmãos... ?
Or maybe, Eu tenho dois irmãos homens (meninos)... ?
Forced into using sibling here, a word I rarely use. She's my aunt, for heaven's sake. Did anyone try "brother and sister"?
Is there a specific word in Portuguese for 'sibling'
No, it is "irmãos". You use the masculine version for plural men + women.