I have a family plan. I can confirm I pay $14.99 per month right now and received an email stating it will increase to $22.99.

Perhaps I'm grandfathered into a cheaper plan, but that's my data point.

You're both right. It was $15/mo, then the price went up to $18 but they didn't raise the price for existing subscribers, but this time they're raising the price for existing customers as well, so for the oldest customers, it's a 50%, $15->$23 hike, and for newer customers, it's a 27%, $18->$23 hike.