Parenting in After Effects is pretty straightforward. But when you change the actual text, path, or size of a parent layer, the children don't always follow how you'd want them to (kids...amirite?).
Thankfully, this is fixable with an expression using sourceRectAtTime(). But the downside to using an expression like this is that it will break the current layout and position of your child layer. So I made a free script to automatically attach layers to the bounding box of their parent. The script applies an expression using sourceRectAtTime(), but keeps the current position as-is.
Pretty easy to use and you can set both horizontal and vertical constraints. I made a tutorial here: