I have a completely unrelated question, if I can interject here for one minute, especially since you mention chalitza and yibum.
I have a friend whose son was killed in a car crash last week, l”y. It is reported that he was in the first year of marriage, but until I got be menacham avel, I don’t know if the wife’s expecting or if there was time for her to already have a baby, but still, I was talking with my daughter about these mitzvos and we were wondering if chalitza is required from each brother or does one suffice? If only one suffices, how does one decide which one – the next oldest in the family? What if he’s unwilling?
If anybody has any answers, I’d be interested to hear. I’ve not heard of these issues coming up too often in our times although I’m sure they do, so I never had a chance to ask the questions.