Reference for Zevachim 11:5

אמר ליה רב אסי לרב אשי ומינה אי אמרת בשלמא קניא להו היינו דחד מיהא מימר אלא אי אמרת לא קניא להו היכי מימר

in connection with tithe, which is also to include the heir, will you say there too, One can redeem, but not two? - Tithe is different, because as far as their father too is concerned it [redemption] can be done in partnership.<span class="x" onmousemove="('comment',' If the produce belonged to partners in the first place, they could tithe and redeem the tithe in partnership. Hence the same applies to a man's heirs.');">⁴</span>

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