MANILA -- Expect the "Pinoy Big Brother" house to be filled with laughter after 87-year-old Josefina Obligacion Arellano joined the housemates on Wednesday night.

Arellano, who introduced herself as Nanay Pina, is one of the housemates of Kanlungan Ni Maria -- a home for the aged in Antipolo Rizal.

She has been under the home's care for 11 years now.

Nanay Pina remains young at heart. She still holds a full deck of jokes, which are mostly pickup lines about random things she sees.

Making people laugh, she believes, is her purpose in life.

"Habang may buhay, may misyon sa buhay. Ang misyon ko po 'yong magpasaya ng kapwa ko po sa pamamagitan ng pagpapatawa," she told Big Brother.

Aside from making the housemates laugh, Nanay Pina is also tasked to teach good values to housemates, who recently had issues among themselves.

The first lesson she taught the teens is to value and serve their parents while they are still alive.

"Hanggang buhay ang mga magulang niyo, pagsilbihan niyo na dahil 'yon ang pagpapakita ng pagmamahal. At siyempre, may utang na loob kayo sa mga magulang niyo," she said.