No, hair sample from a brush or any other source (e.g. pillow, clothing) may be contaminated and there is no guarantee that the hair is from the person being tested. Additionally, this would destroy any legal validity of the test results as proper chain of custody could not be established. If the test results are for solely for informational purposes only and not intended to be used legally (e.g. Parent testing their child) and further that the above risks are acceptable, hair taken from a hairbrush may be tested as long as the sample quantity and length is sufficient as specified in the test instructions.
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DNA & Genetics
DNA & Paternity
