Can i find out if my cousin is my cousin through?DNA?
You can as DNA profiling is used primarily towards this end. This method is highly accurate (relative to other methods) though it is expensive. You will also need to obtain a sample of body tissue from your cousin for comparison purposes.
You can buy DNA tests at drugstores. All you do is use a cotton swab and swab around the inside cheeks. Send it to the location indicated and wait for the answer.