This can be stated in active form. Alternate translation: "those whom he makes holy" or "those whom he makes pure from sin" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Who that source is can be stated clearly. Alternate translation: "have one source, God himself" or "have the same Father" (See: [[rc://en/ta/man/translate/figs-explicit]])
This litotes means that he will claim them as his brothers. Alternate translation: "is pleased to call them brothers" (See: [[rc://en/ta/man/translate/figs-litotes]])