Recently, she confessed to me that she’s seriously thinking of cutting them off from her son entirely after they “refused” to come babysit so she and her husband could have a date night for their anniversary. She said their reasoning — that they’re not comfortable driving in the dark anymore — was just an excuse.

I gently tried to suggest that she’s not viewing her parents fairly, and tried to probe whether she’s dealing with any postpartum depression that’s clouding her judgment, but she just said, “Of course I’m depressed when my parents blatantly favor their other grandkids.” She then refused to respond to any of my texts or calls for the next two weeks.

I have since avoided the topic with her, but I believe she’ll do it. It will devastate her parents, rob her son of his grandparents and drive a wedge with her other siblings. I don’t know how to get through to her. Help!

Best Friend: It must be crazy-making to watch this play out: For her to deny her child these grandparents just because she refuses to accept a ridiculously common problem — declining night vision in older adults! — is parental malpractice.

She can frame her parents’ choices in the best possible way or the worst, and chooses the worst.

You obviously know all this and have seen it play out before. But it was cathartic to write it out.

Plus, I’ve talked myself into advising more forceful truth-telling now with a grandchild involved. She may cut you off for it, too, so weigh that risk before you speak up.

But a clear, loving statement seems warranted: “It is so painful for me to watch you vilify your parents — and discount how much they love you! — when advancing age explains their decisions so much better than favoritism does. I know you’ve felt the middle-child problem forever. But bad night vision is a thing. Postpartum depression is, too.

“So humor me for a second: What if you decided just to trust me on these for a while? And held off on any big decisions, at least till this wild new-baby time is behind you? If you’re right about favoritism, then you’ll still be right two or three years from now and can deal with it then — but if you’re wrong, rushing to cut ties now could do real harm.”

Adapt with your own words, of course, as always.

A reader also suggested talking to the husband about the possible postpartum depression.

Usual disclaimer: You can’t make someone listen who doesn’t want to. Plus an extra disclaimer: There could be stuff in this family even you don’t know about.

But, still, best friends have standing to break glass in case of emergency. Good luck.