My aunt's psychiatric problem -need help

Dear all,

My aunt is having some mental illness since her birth. But when she was young, no one noticed her disability as she looked so fresh and beautiful. After marriage, her behaviour seemed not normal and hence everyone started noticing her in a different way.
But it was all normal to my uncle as he loved her so much and believed that his wife is behaving childishly. Due to their compatibility, no one bothered to intefer into their marital life and so they were somehow managed their life for 20 years with 2 teenage boys.

Now my aunt has become so weak, lost her weight (now she is only 25 kgs) and lost her appitite... She has sleeping disorders and other mental issues, which makes very clear to everyone that she is having some strong mental illness.

She doesnt sleep properly, hence wakes up at 1.00am and washes her cloths. She takes bath in the cold water at 4.00 am... cooks very slowly (and it takes 10 hrs to prepare lunch with 1 curry).

She forces her kids to eat too much of foods and one of her son is also developing the same symptoms now.

Her dressing and behaviour has been changed so much during this 20 years, but her family never noticed this as a huge deal.

Finally someone has openly broke the ice and asked them to meet a psychiatrist. The doctor easily identified her problems and prescribed some sleeping and vitamin tablets. But my uncle rejected those tablets saying that they doctor wasn't clever to understand his wife's issues.

He keeps on meeting other normal MBBS doctors by thinking his wife might suffer from other physical illness such as BP, anemic, etc..etc... as she was loosing weight and eating less. He doesnt seems to understand that these symptems are associated with psychological issues, rather he thinks it is other issues like normal physical illness.

Since they live in our town, I thought of helping them in some way or the other. But I really dont know how... Please, if you can help me with some ideas.