My 7-year-old son often plays tricks on his sister and holds him to sleep. Is it normal?

My son often cheated when he was 7 years old. It is normal for my sister to hold him to sleep, because children are so innocent and lovely. They can depend on whoever they like. Even when sleeping, he likes his sister to hold him to sleep, which shows that he has a good relationship with his sister, so he relies on her. The relationship between brother and sister is so good that the family should be very happy and warm.