grieving a-dad in heart surgery

My a-dad has recently been through heart surgery and the good news is that he's on the mend and doing well. Nonetheless, looking after him while I had recently lost my job, while I was job-hunting, while I was tackling university assignments, eventually took its toll and now I've had a flu for 2 weeks! I know this particularly sub-forum is devoted to Grieving the Death of a Birth Family Member and while 1) my a-dad is not my b-dad and 2) my a-dad is still alive, I thought I'd still post/ramble here since it's the closest sub-forum relating to bereavement (past or upcoming). I love my a-dad dearly and feel sad in knowing that eventually he will die. My a-mom, my stepdad and my 2 birth parents have all passed away and knowing that my last parent will eventually go too makes me feel sad. I'm sure that facing heart surgery prompts one to pause and reflect over all kinds of Life and Death issues for one's loved ones and oneself. Tonight I re-read the book, "Questions for My Father: Finding the Man Behind Your Dad". It's written by a man after his own father had died. The sense of longing and regret in these questions and the author's Afterword are definite undercurrents. And I intend to ask a similar set of questions of my a-dad. Nonetheless, I still feel sad in knowing that eventually my dear a-dad will pass on too. It's no wonder that my current flu has dragged on for so long!:sick: Thanks for listening again while I ramble....