حَقُّ كَبِيرِ الْإِخْوَةِ عَلَى صَغِيرِهِمْ حَقُّ الْوَالِدِ عَلَى وَلَدِهِ (Bayhaqi)
Translation: The elder brother's right over his younger brothers resembles a father's right over his child.
حَقُّ — a right; كَبِيرِ الْإِخْوَةِ — the eldest of the brothers; صَغِيرِهِمْ — their younger members; وَلَدِهِ — his child.
Brief grammar: كَبِيرِ الْإِخْوَةِ is an iḍāfah construction. عَلَى means “over/upon,” and هِمْ refers back to الْإِخْوَة.
The comparison calls for respect toward an elder brother. It also implies that the elder should behave responsibly and kindly toward younger family members.