Upset with caregivers

Well, after being my elderly parent's caregiver, and taking care of everything for them 100 percent (I left another post on here to state how terrible this ordeal was), I think my oldest sister is being a huge trouble maker by telling the office lady at my dad's personal care home that I never told her what was going on with my dad when his health would decline. This is a complete lie, but now the office lady always brings this up to me. None of my siblings were even around ever for my dad. He recently passed away, and I am completely heartbroken. The hospice workers kept saying things to me....like my siblings didn't know my dad was on his deathbed when they absolutely did know!! They chose not to visit him!! The hospice "counselor" called me today, and questioned me about if I was going to give my dad a memorial (he donated his body to science). I think that these workers are being way out of line, and I have no idea what my sister is saying to them. She was problematic before all of this, I think she may even have a personality disorder. She was adopted and has caused problems in my family for years. These workers don't know the history, but I can't believe that they are being professional! After today, I no longer have to talk to them, but it is all just so upsetting to me. I wish I were an only child!!