Had there been a third son in the Prodigal Son parable, one who did "correctly," what might his actions have looked like? It seems to me he would've simply been glued to the Father and emulating the exact things He was doing.
When out in the fields, out in the fields with Him.
When scanning the horizon, scanning the horizon with Him.
When running to the lost son, running to the lost son with Him.
When eating and dancing at the party, eating and dancing at the party with Him.
What's the use of of being in the Kingdom if we're off somewhere else, "slaving" like the older son? What's the use of having all the "property" and yet squandering it amidst the ways of this world? At the Father's side is the Kingdom, the work, the reunion, the joy, the party. There is nowhere else to be if we want Life.