I'm sorry that Dad has been diagnosed this.
Let's wait until someone more knowledged than I'm answers to you, but in advance I can tell you that more details will be asked to you, i e age, PSA, Gleason and tests he has had done, on order to help you.
There are many members with bone met here. Don't panic. It all depends on the grade and other things,
but many medical remedies are available nowadays.
On my part, my husband, 68, is going to theatre on a few hours.
Hope everything goes well.
My best wishes for Dad and family,