in addition to my question my paycheck is $735.00 and I use at least $400.00 to buy food and household items?
If he has gross income of $4,200 or more for the year (social security does not count) you cannot claim him as a dependent.
If all of his income is only from Social Security then you will have to determine if you are providing over one-half of his support for the year. However, if his SS income is $1,485 a month (Annual $17,820) it is doubtful you can claim him. Use this IRS worksheet for determining support - https://apps.irs.gov/app/vita/content/globalmedia/teacher/worksheet_for_determining_support_4012.pdf