RE: Thoughts on tattoo for those that agree with them
Getting a tattoo in honor of your Father is one of the best reasons to have one , I have one in memorey of my Daughter on my upper left chest to keep her close to my heart.
As for your Fathers ashes , I don't think your going to find a tattoo place that will mix them with the ink , there might be some reason for that but I never heard of it before.
Good luck and let us know how it turns out , you might want to post a picture of it when after you get it done.