Grief is disorienting for adults, and we have fully formed prefrontal lobes. For kids it is impossible to process directly.
Instead it comes out sideways and in the indescribable feelings of lostness and powerlessness.
Kids in grief and transition and change are often more whiney or tantrum prone or angry. They are feeling the grief but without the capacity to link it to the narrative.
When a kid is acting out more than normal, reach out instead of clamping down, you might be surprised how much sense their feelings make when put into context.