My Fathers passed away 15 months ago my sister who is executor has not contacted us or anything about estate he had bank accounts and insurance!!

My condolences to you on your loss and on the extra distress your sister appears to be causing you. It's not clear from your question whether your sister ever took any steps to get appointed as Executor, or whether she got appointed but then went incommunicado. I very strongly suggest that you contact an experienced probate attorney in the state where your father had his primary residence and get a consultation. The attorney can ask you questions about the situation and will then be in a better position to advise you on what steps you may be able to take. Please don't wait any longer, however, as these matters can be time-sensitive. As one of your father's children, you likely had rights at some point and you may still have some, but if you've already tried talking to your sister on your own you really, really, really need to bring in an attorney to help you out.