Nigel,
The Callow family is not known to me, however, that is not necessarily very meaningful as I have only been looking into family history for a few months. I do recall my Aunts pointing out a large house, situated well back from the road, in which they had lived after the death of their mother, Mary Ann Forshaw nee Sutherland (daughter of Margaret Sutherland). This may be Riversdale House, as the position I recall would seem right. But who knows how good ones memory may be about twenty years or so after the event? As we 'speak', I am sending a copy of this thread to my cousin, to tap into her memory regarding Riversdale House and the Callows etc. and will add to the thread (which will be at snail mail speed). Other Inns and Hotels associated with the family are:
Victoria Hotel, Stanley Hotel and the Rest and be Thankful at Slieau Lewaigue.
Regards, Peter.