I ve raised 4 girls,I ve had,every kind,of wacko show up ,none ever just walked in.his maners are suspect.just keep it light.I learned the hard way about knocking the kid,making fun of him,etc.be sort of aloof about it no mater how your churning inside,and hope it fizzles out on its own.my daughters knew the rules,try me at your own peril.
