Reference for Sanhedrin 144:1

כאן באב על הבן כאן בבן על האב

the first [Baraitha] refers to a father [robbing] his son, the second to a son [robbing] his father.<span class="x" onmousemove="('comment',' A father has more compassion for his son than a son for his father. Hence, if a father robs his son, the latter must assume that he will not go to extremes if he defends his property. Consequently, he may kill him only if he is certain thereof. But if a son robs his father (and even more so, when he robs a stranger), he may assume that he is prepared to kill him, unless certain that he will not. Therefore, if he has any doubt, he may take his life. ');">¹</span>

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