Kat-
Yeah, I'm amazed at this family...there's the older brother, who is going to the Governor's School of the Arts. He plays flute 8 hours a day; also is a very good alto sax player, but flute is his forte. I'll email you one of his songs, he's a member of a chamber quartet that's phenomenal.
Then there's three sisters. All three play harp, two play violin also. One of the girls won the state championship for harp playing.
Of course the Mom plays keyboards and the Dad sings.

One thing I noticed upon closer examination was the harp has color coded strings; so you know where the octaves are. I'd always wondered what they use for point of reference, like guitar frets.

Anyway- it's an amazingly beautiful instrument, especially when played by an artist, like this young lady is- you can tell it's her passion.

Most of the string squeaks are on wound strings and can be hard to avoid. The cleaner you play the harder you work. If a squeak is intentional, most of the time, you will know it. I do speak from experiance. I've been playing for 23 years.