Every activity doesn’t have to be done in unison.
Children need to be able to explore independent activity to find their personal interests, and what motivates them as individuals.
Social personalities may want to be with their siblings, or at your heels, all day, while your more reserved child enjoys some time to themselves.
Part of teaching children to respect each other, is showing that you need to respect one another’s space and differences.
This doesn’t mean that you should allow your child to be locked in their room all day, but showing that playing together and independently are both important.