You enquire whether you should take action to have your parents charged with murder, following the death of your brother. You should ascertain from a competent lawyer what are your legal obligations in this regard, and follow such requirements. If there is no legal obligation, it is left to your discretion to decide on this matter, in light of the circumstances However, you might well ask yourself, in the course of this decision-making, what beneficial result is to be gained from such an action, more especially if the action occurred some years ago and if legally-acceptable proof is difficult to establish; you should also weigh carefully the effect this might have on yourself, in the process of re-opening the subject, testifying about it in court, and doubtless incurring the antagonism of your parents.