Is incest between a brother and sister, both seven years old and not yet at the age of puberty, considered forbidden?

The Pen is lifted from three: a sleeping person until he awakens, a child until he reaches puberty, and an insane person until he regains his sanity. Therefore, the Pen is lifted from both of you at this age. The sin for any shortcomings falls upon the parents or the guardian responsible for upbringing, as the Prophet, peace and blessings be upon him, said: "All of you are shepherds, and all of you are responsible for your flock," and he also said: "Command your children to pray when they are seven years old, and beat them for it when they are ten, and separate them in their beds."