Reference for Moed Katan 40:16

אמימר שכיב ליה בר בריה קרע עילויה אתא בריה קרע באפיה אידכר דמיושב קרע קם קרע מעומד

- This proves it.<span class="x" onmousemove="('comment',' That the distinction made by R. Huna supra is correct.');">³⁰</span> It is also taught thus [explicitly] 'They did not lay down [that one should observe formal mourning] out of deference to his wife, save [at the death of] his father-in-law or his mother-in-law alone'. Amemar lost his son's son, and he rent [his garment].

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