This conversation is still active. I am still hoping to find a living male Porter, who may be a descendant of David Rittenhouse Porter. It sounds like your father's surname may not be Porter since you referred to his mother, Emma. If he is not a Porter, I am not sure what information Y-DNA testing would give us with regard to the David Rittenhouse Porter line, but it would definitely provide information as to whether our families were in any way connected. I would encourage you to have his Y-DNA tested to add to the present Y-DNA database.
Thank you for your response to my message.