____ is their barbecue?

The family often have a barbecue in the garden in summer.
Where is Tom? - He is upstairs. He is checking his email.
What are you doing under the sofa, Sam?- sh-sh.
She does not like Maths. Her favourite subject are History and Literature.
Mum is in the kitchen. She is making a birthday cake for Ann.
What does he need for his unusual experiment?