All of Jesus' brothers were younger than he was. This can be made explicit in the translation as long as it does not suggest that Jesus also had older brothers. Alternate translation: "when his younger brothers" (See: [[rc://en/ta/man/translate/writing-explicit]])
These two phrases mean the same thing. The idea is repeated for emphasis. Alternate translation: "very secretly" (See: [[rc://en/ta/man/translate/figs-doublet]])