Is it true that ‘parents are like doctors, but siblings are like nurses’?

For the purpose of this essay ‘parents are like doctors, but siblings are like nurses’ will be considered in terms of the relative influence of parents and siblings on the development of a child from their early childhood through to adolescence, and how that mirrors the relative influence of doctors and nurses on patient care and recovery.

Is it true that ‘parents are like doctors, but siblings are like nurses’?