Just relax and do what he said :))
Rheumatologists: are specialists in arthritis and diseases that involve bones, muscles and joints
Answer:
1) Nico might be developing Parkinson's disease.
The given symptoms are very much similar to Parkinson's diseases such as week leg and tiredness, problem in performing simple task even writing or opening doors. Other than this physiologist also found the atrophy of the muscle.
2) In Parkinson's disease slowly brain cells destroy which makes it a degenerative disorder. The region of the brain that controls movements get affected due to brain cell damage. Slowly the movement becomes less and slow to perform simpler tasks too. increased muscle tone leads to muscular stiffness.
3) Damage of basal ganglia can lead to the lack of dopamine that causes this disease. Several reasons such as cerebral arteriosclerosis, cerebral encephalitis can lead to damage of basal ganglia.
Do what they want you to do right now. And help them when you weren't even asked too. Don't ask constantly bring the idea up. ask every once in a while. And show attention to the cats and the dogs. So that your parents see that you really care about them and that you will take time out of your day to do stuff for the animals in the household. And also make sure you have good grades too.