You could always phone from hawaii to say hello to sis and her family. Do some quick meditiative digital videos of nature...put it to music as a gift to her.

I have several sisters....it is very doubtful any of them would want another person to be always miserable and sad if they were feeling the same. It doesn't help the situation.

AFter all, good sisters in worst of times, turn to each other for support..and the giver herself must be happy and strong to give well, for the sad sis.