BW it makes perfect sense to me as someone who has never been thru IVF or fertility treatment. I wouldn't in any way find it offensive, unclear or be in the least bit troubled by following your guidelines. (But then, I'm not my MIL or the apparently numerous ppl like her who don't seem to have a sensitive/understanding bone in their bodies and believe the world revolves around them - and I only say this because I think you have similar ppl in your own life!).
I would definitely pass it on, I think the humour you've used makes it an easy read. And if they're offended, who cares? What's the worst they can do? Never bring it or the IVF up again? At least the ball's in your court.
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