The MC already nows what is going on .
Wouldnt it be better for him to "load" again and tell kusora that the mansion will be under attack so they can properly prepare for it?
Hmm first it said grandfather's younger brother, then younger brother's son.
The latter is probably correct going by his looks/age. If you're getting pushed back in your own lair like that, you should improve your defenses (if you make it through).