and his mother
(idiomatic) Serves as an intensifier for an inclusive noun or phrase such as everyone, anyone, each someone or all someones.
It looks like everyone and his mother has come out tonight.
Anyone and his mother could see through that disguise.
The boy is special, Aunt Annie told his mother, and his mother in turn told him. But what kind of special? No one ever says. J. M. Coetzee
I look a lot like my father and his mother. Sade Adu
I have gone above and beyond to care for my child, including an agreed upon monthly stipend, a house, a car, insurance, school and other essentials for the baby and his mother as well as many other things, including toys and clothing. Robinson Cano
Surah xxiii. 52: "And we appointed the Son and his Mother for a sign; and we prepared an abode in a lofty spot, quiet and watered with springs." Jesus Christ
It is said that when He was an infant in His mother's arms, He wept continually, and when the neighboring ladies and His mother cried Haribol! He used to stop. Thus there was a continuation of the utterance of Haribol in the house, foreshowing the future mission of the hero. A. C. Bhaktivedanta Swami Prabhupada