Do I need guardianship for my mother?

I am trying to prevent any legal battles from my older siblings. There is a 'tug of war' when it comes to taking care of my mother's heath care personnel and splitting extra expenses incurred for mom. My siblings have cause many problems for me, I have to always spend extra time trying to explain their anonymous phone callings to my mother’s health care agencies to include the Department of Age and Disability instead of calling me. My siblings are rebellious and are not having communication with me in reference to finding out matters dealing with mom. They do recent I have acquired the POA for mother. However, they want to come visit mother from out of town once or twice a year, mainly during the holidays; consequently they need space to stay while visiting mom, and ask the ‘over-night’ personnel (I have hired to take care of mom) not to show up because they need all the bedrooms available at mom’s house to accommodate their holiday stay. My concern is that they disturb my mother’s routine to include hosting dinners with boisterous and long daily schedules for mom. Incidentally, my mother is 94 years old and is showing signs of dementia. The Department of Age and Disability manager has asked ME to tell them to stop causing so much commotion with all those bogus phone calls to health care agencies to include the DAD agency or they will remove mom's health care assistance. My siblings and I are no longer having any type of communication.