Regarding it being disliked for a person to propose after his brother's proposal
باب فِي كَرَاهِيَةِ أَنْ يَخْطُبَ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ
2081
Abu Dawood
Sahih (Al-Albani)
حَدَّثَنَا أَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ، حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لاَ يَخْطُبُ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ "
Abu Hurairah reported the Apostle of Allaah (ﷺ) as saying " A man should not seek the hand of a woman in marriage when his brother has already sought her hand."
Reference: Sunan Abi Dawud 2080 In-book : Book 12, Hadith 35 English translation : Book 11, Hadith 2075
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