Sapai Glai Peun Tiang(2009)

Original title: สะใภ้ไกลปืนเที่ยง

Latin is a hot-headed dedicated cop in the Crime Suppression Division in Bangkok. She returns home to visit her family and discovers that her sister Areeya is pregnant by a guy she met in Bangkok. The family, especially Lalin, want the deadbeat daddy-to-be to take responsibility, but Areeya refuses to disclose his identity.