1) The document is a letter from a parent to their child about caring for them in old age with patience and understanding.
2) It asks the child to be patient if the parent gets dirty, needs help dressing, or repeats stories, and to listen to them instead of interrupting.
3) It reminds the child that the parent cared for them as a child and taught them many things, and asks the child to now help the parent as their abilities decline with age.