Santa Claus 
Santa Claus in a dream represents comfort and happiness because he may have a strong connection to your father.
Alternatively, Santa Claus may represent Christmas.
A Santa Claus who appears menacing in a dream indicates that you are feeling stressed preparing for a holiday.
To see someone dressed as Santa Claus in a dream applies the characteristics of Santa Claus to them. For example, to see your brother dressed as Santa Claus indicates that you believe he is a kind and generous person.
Grandparents
To dream about your grandparents indicates affection, comfort, intelligence, and safety.
To dream that you are looking for your grandparents suggests that you seek out affection and security in your life. You could be slipping back into childhood desires.
Sister In Law
To dream of your sister-in-law symbolizes attributes that the both of you may have in common. Also, contemplate the bond that you both share. If you are arguing with your sister-in-law, it may imply that you refuse to accept that you both have certain aspects or attributes in common.
Brother-In-Law
If you dream of your actual brother-in-law, consider the situation and the circumstances in the dream. This dream has more to do with every details such as occurrences and events than a visual image of your brother-in-law.
If you currently don't have a brother-in-law but dream that you do or you're the one, it symbolizes your search for family and acceptance.
Alzheimer's Disease
The presence of Alzheimer's disease in your dream indicates a fear of aging and loss of ability whether it is mental or physical. This is a general concern for many people, and therefore a common dream to have especially if you're in the late middle age.
In the case that there is someone in your waking life with Alzheimer's disease, this dream holds even greater weight. Take this as a reminder to maintain a healthy mind as well as a healthy body.
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