It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) forbade that a person should sell over his brother's sale, or send his marriage proposal over his brother's marriage proposal.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 6135
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 5142، م: 1412، وهذا إسناد حسن من أجل ابن إسحاق .