Answer:
The correct answer is - compassion fatigue.
Step-by-step explanation:
Compassion fatigue is stress condition which is also known as the secondary traumatic stress that is develop due to the less or no compassion over time. The compassion fatigue is develop in individual who has no one or live alone especially in older age.
In this case the old parent have high risk of developing compassion fatigue as he is only one taking care of his bipolar child so he might experience less love compassion over period of time.
Thus, the correct answer is - compassion fatigue.