That is simply outrageous. I recently lost my mother after a long terminal illness, and while I hated to see her suffer, and it was a pain at times, I had no regrets about helping take care of her, not even when I was actually doing it. I wasn't an obligation or a duty, it was because I cared about her and wanted to help however I could.
Sad, really. The only real growing I've ever done, the most fufilled I've ever been, the times I've felt the most meaning in my life, were those times that I cared for someone who was totally dependent on me.
A real burden would be not having someone to care for and love.