Gerard is the heir until Tad is 21. There is just so much wrong with this and so many other options. If Daniel had been under a spell, it might be plausible, but there was never any indication of that. Then there is the fact that Daniel has been portrayed as loony tunes. Q gets everything back if he is free. Gabe gets nothing as he was provided for by Daniel's wife.
Gerard wants a witchcraft charge against Q. Charles helps him plan Mrs. Wards death and she collapses in Q's cell.