Oh Steve,
this is so much to bear.
I hope you can visit your dad. If he is in bad shape with the pneumonia you can just sit with him and hold his hand. I like Donna's idea of recording your voice for your sister... check with the facility whether they will allow her to have the equipment in the room to listen, but I would think so, since there are other machines.
I send you much love and lots of (((( HUGGGGS )))). And send healing thoughts to your dad and sister. I will pray for them too.
~ waves ~