I've had another phone call that has made me feel better. My brother in the US, who has seven children and has not always made the most sensitive comments about this whole affair, phoned me up. Normally, the infertility/IVF thing is not mentioned at all, and since we haven't been making big announcements about all our appointments, there's no real reason for him to have brought it up now.
But after a bit of chit-chat, he suddenly asked how it was all going and what our next plans were, and rather than being all doctor-y and giving me slightly-more-knowledgeable-than-that-of-the-average-person-but-let's-not-forget-he's-not-a-fertility-specialist advice, he just listened, asked questions and made sympathetic noises.
And then he said, "It's sometimes hard for [SIL] and me to know what to say, because we're worried that anything we do say will sound a bit hollow, but we want you to know that we both think of you such a lot, and that all the family are constantly praying for you."
I'm not sure if he was also conscious of the timing and that's why he suddenly spoke up out of the blue, but I'm so pleased he said it. Between this and the conversation with my mother yesterday, I feel so much more supported.