Can a 17 year old refuse to take DNA test confirm who his father is?

It depends on the jurisdiction and the specific laws in place. In some jurisdictions, a minor may be able to refuse to take a DNA test to determine paternity, while in others, the court may order the minor to take the test if it is in the best interests of the child.

Generally speaking, if a minor's refusal is based on mature deliberation and consideration of the potential consequences of the test, the court may respect their decision. However, if the refusal is deemed to be unreasonable or inconsistent with the child's best interests, the court may override the minor's objection and order the test to proceed.

It's important to consult a local family law attorney to understand the specific laws and procedures applicable in your jurisdiction and to determine the rights and options of a 17-year-old in this situation.