The Warlock's Grandfather - Warlock of Gramarye

WHAT ARE WE GOING TO DO WITH GRANDFATHER? In this short story, when old Count Rory -- patriarch of d'Armand Automatons -- begins to lose his grip on reality and retreat into a fantasy world, it threatens his company, his noble house, and his family.  Is he just a senile but harmless old man, or a danger to himself and others?  And what, if anything, can be done about it?