I'd like to know your general thoughts and opinions on this.
Can siblings discipline younger siblings successfully or is it only successful coming from parenTs?
Pesronally after a few attempts myself I have come to the conclusion that it is the parents who can most successfully discipline siblings/children. If a sibling tries but the younger sibling goes off on a tantrum and ends up running to their parents who at the time might not be iin the "disciplining" mood end up being soft on the child it's no result for the sibling attempting.
So I say parents are in the biggest position to discipline children unless they are in agreement with the sibling disciplining them!