Reference for Sanhedrin 55:6

אמר רמי בר חמא סברא הוא כדתניא אין העדים נעשין זוממין עד שיזומו שניהן ואי ס"ד בנים לעלמא כשרין נמצא עד זומם נהרג בעדות אחיו

[To teach] that they too [areineligible] in respect of each other. Thus we have found that 'sons' [areinadmissible] for each other. Whence do we know their inadmissibility [asjoint witnesses] concerningothers?<span class="x" onmousemove="('comment',' I.e., that witnesses who are related to each other may not join in giving evidence in a case concerning strangers. ');">⁶</span>

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