Please pray for my dad

As you all know, my dad has been fighting sarcoma for the past 2 1/2 yrs. He had been feeling great and doing so well. A few days ago that changed. He is now extremely short of breath, even on oxygen, and has a terrible cough where he feels he just cannot catch his breath. He is at home but is very tired and sleeps alot. We took dad to the Oncologist yesterday and he is trying different medications to help with the cough and pain but so far it doesn't seem to be helping. The tumors in his lungs have just reached a point where they are just too big for his body to deal with and his chest x-ray actually shows more tumor tissue than healthy lung tissue. We all had a great talk last night as dad explained his wishes to us. It was truly God's grace allowing him to communicate so well to us and giving us that special time together as a family. We're not sure exactly what the future holds, but are taking it one day at a time. Please pray for my dad to be pain-free and not struggling so much to breathe every breath. Please also pray for my mother as she tries to deal with the situation. We just all need peace and guidance right now!