His son is exploiting his old man 100 - 0! That's just typical(?) in setting like that, almost senile dad or father figure and kid has been away from home for few years.... BOOOM! big cash settlement for dad, child moves back in "you need me and i love you, i missed you so much!". Dad is ofcourse naive and trusts in his stepson/son and gives in...
I would insert that excalibur in that bastards ass for sure, brick.