If you harbor hurts from a parent trying to make peace with you, be honest. Perhaps the best you may be able to offer is to tell you're parent that you appreciate them reaching out and that you are willing to work on forgiveness. As we age, we also come face to face not only with our mortality but with our beliefs about an afterlife. Again, the best that you can offer is listening. Finally, as we age, we may become fearful not so much about dying but about what we will be like as we die.
Many persons fear senility or some other form of disability.
Open and honest discussion about this can ease some fears. Don't be afraid to ask for help. If your parent is struggling spiritually, don't hesitate to ask them if they would like to talk to a spiritual counselor of some sort. Finally, keep in mind that you may need your own support system as you minister to your parents. As we watch our parents age, we begin to grieve.