Yevamot 96: Pushing the Parameters
3 mishnayot on the daf... Mishnah 1: Complicated scenarios to explore the parameters of testimony on a spouse's death that is determined to be incorrect. Including multiple marriages, and multiple reported deaths. Plus, the case of a woman who needs yibum and a 9-year-old brother sleeps with her (ahem) before other (older brothers), and he negates his brothers as possible yavamim. Mishnah 2: More on the 9 year old and a yevamah. Mishnah 3: Other cases of a minor in the context of yibum.