SHOULD I SIGN AN AUTHORIZATION FOR MEDICAL RECORDS AND WAGES TO INSURANCE COMPANY OF MAN WHO HIT ME?

THE STATUTE OF LIMITATIONS WILL BE UP IN MARCH, 2015. PERTAINING TO MY INJURY AND LOSS OF SISTER. MY SISTER WAS KILLED BY ANOTHER DRIVER. BY 2 DRIVER'S WHO HIT US AS PEDESTRIANS.. OUR PERSONAL INJURY ATTORNEY WANTS US TO SIGN MEDICAL AND WAGE RECORDS AUTH. FOR THE DRIVER'S INSURANCE CO., WHO HIT ME, ACCORDING TO POLICE REPORTS. OUR LAWYER SAID HIS INS. CO. IS ENTITLED TO HAVE THIS INFO? BUT BOTH MY NAME AND MY SISTER'S ARE ON THE LETTER UNDER THEIR CLIENT'S NAME AND WE AS OUR ATTORNEY'S CLIENTS, IS THIS PROPER TO ACKNOWLEDGE BOTH? HE SUPPOSEDLY HIT ME ACCORDING TO REPORTS BY POLICE. I WAS LIVING IN MA WHEN ACCIDENT HAPPENED. HIRED A MA ATTORNEY. I AM BEING PUSHED TO SIGN THESE DOCUMENTS TO DISCLOSE ALL THIS INFO. SHOULD I? HIS INS. CO. WANTS OUR ATTORNEY TO "EXPLAIN HIS THEORY" FOR THE DAMAGES SUSTAINED TO EACH CLIENT? WHY ARE THEY CONCERNED ABOUT BOTH OF US WHEN IT WAS THEIR CLIENT WHO HIT ME AND A DIFFERENT PERSON WITH DIFFERENT INS. CO. WHO KILLED MY SISTER ? HOPE YOU CAN EXPLAI