In our main rotation:
my son's 3x8 24" Giant mtb
my daughter's 3x8 50 cm Trek 1420 road bike
the 3x9 road bike 55 cm Lemond Reno road bike I have for my daughter when she outgrows the 50 cm road bike (technically the 55 is the right size for her right now, but it feels tall to her after riding on a too short bike for too long)
my wife's 3x8 upright city bike (built on a Cannondale st400 frame)
my 3x10 Colnago Super/Suprissimo Piu (Campagnolo) that's on the trainer
the 3x10 Eddy Merckx Ti (Campagnolo) I'm building that I "needed" to ride outside because the Colnago is always on the trainer and I'm tired of jacking the seat way up and riding the 55 cm Lemond (my bikes are 62-64 cm) when we go for family rides
the 3x10 80's sport touring bike that's next in the queue - wide tire commuter / almost gravel bike - (Campagnolo shifters, Shimano derailleurs/wide cassette with shiftmate to make it work).

Fortunately, it's just my bikes that mainly need wheels swapped and my Colnago mainly sits in the direct drive trainer without a rear wheel because mine are the only ones where the wheels could be swapped.