Regarding it being disliked for a person to propose after his brother's proposal

Sunan Abi Dawud · Book 12 · Hadith 2080

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 Messenger of Allah(ﷺ) as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.”

Sunan Abi Dawud · Book 12 · Hadith 2081

حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لاَ يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلاَ يَبِيعُ عَلَى بَيْعِ أَخِيهِ إِلاَّ بِإِذْنِهِ ‏"‏ ‏.‏

Narrated Abdullah ibn Umar: The Prophet (ﷺ) said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goo…