Complex sentence: This is because the eldest son would take responsibility for his mother after the death of her husband; any other sons of Mary should have taken on this responsibility if they existed, therefore arguing against a direct natural brother relationship.
Split into simpler sentences: This is because the eldest son would take responsibility for his mother after the death of her husband. Apologetic Study So any other sons of Mary should have taken on this responsibility if they existed, therefore arguing against a direct natural brother relationship.