I have three siblings, but one was born 16 years after I was, so she was a baby/toddler when the rest of us were in high school/college/university. Same rules for the older three. My baby sister got a lot with a lot more since my parents were older then. LOL! We had two TVs and two (house) phones. This predated cell/mobile phones. Yes, we each had a musical instrument(s). One of my brothers played drums. One played guitar. I played piano and French horn. We never jammed together.
My brothers shared a room. I shared a room with my sister when she was born until I left for university, two years later.