I'll tag along.
Let's say that there's this Brazilian family that lives in the UK. It's composed of a mother, a father, a son, and a daughter. Apparently, they have adopted another son and the daughter's cousin. They have 1 maid. One sunday morning, the adopted son was found dead in his father's office. When the police interrogated the living family members, the answers were:
Father - I woke up late
Mother - I was at the garden
Real Son - I was playing osu! at my sister's room
Maid - I was at the postal office
Daughter - I was reading Yaoi at my room
Cousin - I was the first one who saw my dead brother
After this, the police immediately took one family member and arrested him/her. Who was the real culprit?
Note : Everyone is of adult age.