Prayers Please!!!

Many of you may know that my dad has suffered with Leukemia since May of 2008.  He was put into a drug induced coma at that point for about 2 months.  He then had to go through rehab for quite a while.  He had to teach his body things again that are so normal to the rest of us, that we often take them for granted.  He got to come home in November 2008.  He seemed to be doing so much better.  He was taking longs walks everyday(he could hardly move after the coma), playing guitar again, etc...  He was able to go back to work last May.  After 2 days, he got sick and found out he had pneumonia and that his cancer had returned.
This time around he had to get a stem cell transplant.  My Aunt Krsten was the donor.  They had to kill off all of his bone marrow, then replace it with her stem cells.  This was towards the end of the Summer.  He is still in the hospital and has been struggling so much.  Every time things seem to getting better there is another setback.  Well, now there is a huge set back.  Last night he was intubated, put into his 3rd coma, due to bleeding in his lungs.  They did a biopsy to see if there is an infection or if his lungs are breaking down.  He is in our Heavenly Father's hands now.  All we can really do is pray at this point.  That is what I am asking anyone who may read this.  Please pray for him.  If it is His will that my dad should be with Him, then I suppose I will have to accept that when that time may come.  But my dad is only 55, I have never gotten close to him.  I don't really have a relationship with him.  So now I am in a bit of a panic mode here.  I want another chance with him.  I don't want any regrets about our relationship.  I don't want my mom to be alone.  I am not ready, and I am hoping that my dad isn't ready for this either, but it seems he realizes what this all could mean.
Please pray for him.  Please!!