Hmm..... Mark Ireland sounds very sincere ......but IMHO his father's billet reading performance looks like trickery to me ...
I should read Mark's book before saying this but I want to say it before some smart ass pseudo skeptic points it out ....Even when taped up the tiniest of gaps enables the magician to see down the side of the nose. So although the taped is covering the nose gap for all to see, when the black fabric covers are put on top, that is no longer necessarily true. All one would need is one plant in audience (not even essential) and while the audience is enchanted by the correct information, a hand seemingly innocently holding a ticket against forehead can help loosen tape enough to provide a visual gap for later readings.
Another problem is that his father's performance is too good to be psychic ability IMHO

, if true he should have entered a parapsychology lab rather than TV programme.
Perhaps Mark's father (and uncle) were truly psychic to some extent .... but perhaps like some others in past there is a temptation to embellish more modest psychic abilities with more impressive tricks....there have been many magicians who believed in psychic phenomena but found it not impressive enough to use for public performance.
I think I will buy Mark's book, mostly for Mark's investigation to communicate with son.... that rings more sincere and true to me.