He would be Thomas J. IV (m)
Since he is the fourth in the family of the same name. Whether or not your father was dead doesn't factor in, unless you want to create mass confusion, at least, in my understanding.
For more, see http://en.wikipedia.org/wiki/Suffix_(name)#Junior.2C_Senior.2C_and_Roman_numerals
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Messages

Name succession  ·  Thomas J. Byrne  ·  12/19/2009, 2:04 PM
He would be Thomas J. IV (m)  ·  Glass Angel  ·  12/20/2009, 6:41 AM
Re: He would be Thomas J. IV (m)  ·  T Byrbe  ·  12/20/2009, 11:23 AM