Mother and Father

and were the first two puppets Sasori ever created. They were made to resemble his real mother and father, after they were killed while away at war by Sakumo Hatake. He made them in the hopes that doing so would help him feel loved. Because they were still only puppets, this failed, and Sasori lost interest in the two and left them behind when he left Sunagakure. With his departure, the puppets came into the possession of Chiyo.

During Chiyo's battle with Sasori years later, Chiyo uses the puppets against Sasori, though he easily disables both with the Third Kazekage puppet's Iron Sand. After the Third Kazekage was destroyed and the Iron Sand's hindrance was nullified, Chiyo uses the puppets to stab Sasori through his core in the form of a hug, allowing him to be close to them in death as he couldn't be in life.

After Sasori's soul was released from Summoning: Impure World Reincarnation, he handed down his Mother and Father puppets to Kankurō, entrusting them to him.

Abilities
Over the years, Chiyo made several modifications to the puppets, such as adding weapons, so that they could be used in battle. Both have a chakra shield installed in their arms, as well as razor wires that they link together with their fingers for cutting. The Mother puppet wields a serrated katana, while the Father puppet wields a segmented wooden whip covered with kunai.

Trivia

 * In Naruto video games, the puppets are commonly used as Chiyo's main method of attack.