Thank you. I know it's never too late to make changes for better. And so nice to read, that you are not having many regrets. The study part ok, I think we all have been there and done that in a way we could have been better. 

But the part about spending more time with your sister - like said before - it's never too late. I bet she is feeling the same, and she would love to be more with you in the past. But obviously there wasn't the right time, and you will surely have more opportunities when the time will be right. I can just thank all this amazing technology, which is holding us all together with our loved ones.