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Cetti and Clanad, thanks very much for your very comprehensive answers, I certainly understand the phenomenon a lot better now, and I'll pass on what you both have said to my brothers, and even though, as I said previously, I hold an open mind on it, and still do, two things have come out of this.
1) I'm going to tell my younger brother, that even neither myself, or the elder have a recollection of our mother speaking in tongues, (she had a very interesting life, and her faith was unshakeable), if he seems to recall that she did, to go ahead and include it in his writings.
2), There's a Pentecostal Church a short walk from where I live, I don't want to convert, but if they'll speak about it, i'd like to find out more.
And if I need to know anything else, i'll certainly post back.
Thanks very much.