It is very sad to know that your father had to suffer from Alzheimer's disease at an age where he was very active. To tell in short about Homeopathy, it is a holistic science and is based on the individualizing a remedy for a person at a given time and situation by the method iof case taking. Case Taking involves interviews with the person to understand the symptoms ans signs of the troubles the person is going through. Through this way, a Homeopath is able to find correct and precise information and the intricacies of the character of the person. This whole process can take up to 2 to 3 hours in the first consult. The subsequent consultations last generally for 30 minutes or even lesser. On the basis of this knowledge, a Homeopath accesses his Repertories which are in the form of books or compiled in a software. With the help of Repertories, the more similar remedies are selected andthen are finalized with the faculty of Homeopathy Materia Medica. Some Homeopaths also make use of the facility of Pendulums to finalize the selection of remedies. While Homeopathy remedies do not have any materialistic dosage, they are all energetic remedies and would thus be able to stimulate the functionality of the brain and the other suffering parts of the body, but from a mind level. And it is also advisable to undergo a treatment with Homeopathy, if you have already given 2 long years to Allopathy and have not observed any positive results.