broward sheriff department came into my home while my daughters where sleeping looking for my brother are they allowed to ask minors questions,

I guess the bigger question is "was your brother staying there or were you coverning for him".  If the cops had a warrant, which it sounds like, there may have been some basis for them to inquire. It doesnt sound like they were looking at misconduct by the children or taking testimony from them as witnesses or anything. It would also matter if there was some coersion of some sort where the kids refused to speak but were forced to somehow and thier ages.