It depends and yes I have.
My DF had lung cancer-today is his 6th anniversary of his death. His "sisters" had a problem with him donating his body to science. They wanted me to try to change him mind and even told me that when he died, he wouldn't know if I sent his body to his home state.
I was his POA, on his Advanced Medical Directive, the Executor of his will. I knew what he wanted and set up, I wasn't going to go against it.
They wouldn't come his last week, as one couldn't take off work-works part time and never needed money and the other is just a blank. I had to tell him they weren't going to come. He was trying to hold on til they got here.
He told me not to call them when he died and I didn't. He also told me to ignore any requests for anything in the way of pictures. He passed away, I went to the hospital signed for his body to be release to the school. A few days later ,one of them called and asked how he was, I said he was at peace and hung up.
One of them actually called again and asked for a copy of his military discharge paper so she could get a plaque to put in between their parents graves. That was a big ol nope.