Need help on three gift ideas

My boyfriends family has really close birthdays in February, so they’re having a combined birthday for his dad, sister, and brother. I got invited and want to get them gifts. Anybody want to help me out with ideas?
The dad- mechanic, loves music, and always needs a massage.
The sister- 16, loves music, tik tok, and memes, wears makeup
The brother- 21?, plays the guitar, leaving to work on a cruise ship for 6 months.
I was thinking a massage gun for his dad, and press on nails and a gift card for the sister, but I don’t know if those are good gifts.
Any ideas? Even if it’s something general.