reborn as a little brother

Shen Anyi died, and he lived again, reborn in an eleven-year-old boy, still a little boy with a master ...; The family is trivial, warm and plain, which is a simple and plain story, and a family of three lives happily. In this world, the simplest is the most rare. So there is this story. Partial reality, the main warm and plain wind.

(But it seems that the elder brother of the attack is married and has no younger brother. I wonder if it is the one you are looking for)