Uncle's Truck

You were finding your Sister But you opened ur uncle's truck in the back And saw a dead body there It was sis.. Who killed her? Suspects 1. Father - I didn't do it I was cleaning my room? 2. Mother - I was washing the dishes.. 3. Brother - My sis?..NO..SHE DIED.. 4. Uncle - I was sleeping on my bed! 5. Big Lost Sis - my mom locked me in the basement..even tho I was sad? 6. Baby - Googa! (I didn't do it!, I was drinking my milk!!)