Can my sister change the locks to my deceased parents home preventing me from collecting my stuff

I was the sole care giver to both of my ailing parents for over 10 years. My father passed away two years ago in my mother passed away May of 2018. I had remained in the house with my husband and daughter up until end of June this year because two years into caring for my parents, they required Around the Clock attention so I had to sell my family home and move in with them. I took them to every doctors appointment, administered all their medications,paid for all of their needs( with the exception of their mortgage) I was there medical proxy, and I dealt with every and all medical personnel and situation that they encountered. Recently my younger sister who made herself the administrator to my parents home under which is currently in probate, change the locks on the doors preventing me from obtaining the rest of my belongings. This sister is one a four daughters my parents had. One of which passed away 3 years ago leaving only 3 of us .