Thanks for reaching out, tuanphan.
I ended up putting two text links at the sides, and the "About" drop down is working for multiple sections, which is good enough I guess, even though it requires a new page to load.
What I wanted originally was for the other About sections like "Meet the parents" to fade the old content out, and the new content in without having to load an entirely new page. Where it's at though still works for my needs.