An octave consists of eight lines of verse, which are usually iambic pentameter in English and hendecasyllables in Italian. The octave is the first section of a Petrarchan sonnet, which is then followed by a sestet (six lines). The Petrarchan sonnet is a type of poem that was popular throughout the Renaissance, and was extensively used by the Italian poet Petrarch.
The subject is 'uncle' because it is the one who make the action and response to the question: 'Who made the action exprimed throw the verb 'is eating' ? '