I currently have 3 for myself (I've bought 13 but handed down or gave others as gifts and sold off even older ones)
iPad Air 2 - my main device
iPad mini 4 - secondary device and also light travel device
iPad 2 - upstairs/office toilet room device (took back from my dad when I got him an iPad Air)
There still in use:
iPad mini 4 - Sister
iPad mini - Brother-in-law
iPad Air - Mom
iPad mini 2 - Mom (book reader/travel)
iPad Air - Dad
iPad 2 - Nephew
iPad 2 - Niece
Sold Off
Original iPad
Original iPad
iPad 3
No real interest in the Pro, I'm not the creative type and seems to big for how I use my Air 2 currently.
I'll probably get an iPad Air 3 when it comes out and hand down the Air 2. It is always a win-win and lets me justify getting a new device each time they come out!
Time flies, that was 5+ years ago. I have even more now and tend to just repurpose even older ones. I'm a tech hoarder.
iPad Pro 2018 and iPad Air 4 are my main devices. The screen on the Pro is cracked, but still usable.
iPad Air 2 - the iPad I let my friends daughter use (age 6).
iPad Air 2 - My "work" iPad used for BB services/VPN
iPad 2017 - Upstairs iPad
Also still in use:
iPad mini 4 - Sister (hasn't changed). She really likes the mini form factor, but the 5 was a disappointment when released and still awaiting the 6.
iPad Pro 10.5 - Mom
iPad mini 4 - Mom (book reader/travel)
iPad Air 3 - Dad
iPad 2018 - Nephew
iPad 2018 - Niece
Have But don't really use anymore
iPad Air (still keep around because I have a T-Mobile free for life SIM)
iPad mini 2 (Friends Daughter was using, but since it doesn't support iOS that supports Apple Arcade it isn't being used now)