I know how partial whistle players are to their whistles, yet I wonder if they play other instruments.
Just out of curiosity - what other instruments, however inferior, do you play?
the flute has the same fingering…
Guitar, bass, mountain dulcimer, and fiddle. 
I play the tin whistle mainly ,but I play ,as additions:
fiddle,german+irish flute,crystal flute(hall flute),crystal whistle(self creation) ,mandolin,guitars and abit banjo
Cello, bass, guitar (not well, just for fun), djembe, flute.
I hope learn other instruments, bombarde, galoubet …
Life is too short 
FLute, currently
I also play guitar, but only for home/hobby. I’m pondering selling my electric 12.
Also bass.
Also GHB, in the distant past.
" Recorder " " " "
Well, for Irish music, I play bodhran too, though not as often nor as well as whistle…I’m also looking into getting more serious about figuring out flute.
Besides that, I play clarinet, sax, a little basson, and a variety of Renaissance instruments (recorders, crumhorns, etc.).
~Crysania
Nose Flute
jug
pint bottles
and occasionally my larynx after I empty a pint.
Several more pints and you might play your esophagus.
Bass, upright mostly, but a little electric
Guitar
5 string banjo (frailing)
flute (loooong ago)
Sax (looooooong ago)
fiddle a little (very little)
whistles a lot more now
spoons (mwuhaahaahaha)(I do prefer wood!)
Sing some
mountain dulcimer (I play bass dulcimer almost exclusively)
hammered dulcimer
bodhran (so-so)
piano
Missy
This is edited because I accidentally double-posted 
Flute
French Horn
Ocarina
Recorder
Piano
Piccolo
…and I’m learning mandolin
Flute, clarinet, lap dulcimer.
Guitar (my main instrument)
Mandolin
5-string banjo
Fiddle 
Bass
Flute
Harmonica
Mountain dulcimer
Erhu
Xiao
Autoharp
Taisho-goto
Kazoo 
Irish tenor Banjo
Mandolin
Guitar…a little bit
In addition to whistle I play flute, recorder, quena, South American panpipes (sikus), and kaval. I tried harmonica, learned a few simple tunes, but didn’t stuck with it.
Attempting flute
Blues Harp
Guitar
Bass guitar
Bodhran
Mandolin (early days, but getting on ok)
mouthorgan (harmonica if you prefer)
Keyboards
I’d love to have a go at tenor banjo and perhaps bazouki, but neither time nor money really permit…
Let’s see, in the order in which I started learning them:
Clarinet
Harmonica
Sax
Basoon
Flute (the nickel-plated student model kind)
Guitar
Bodhran
[Tinwhistle]
Bones
Dumbek
Flute (simple system Irish)
I can’t decide what to try next, Mandolin or some kind of Dulcimer.
Probably whatever is easiest to sneak into the house w/o my wife seeing
I think I may have musical A.D.D., I can’t stick with one instrument for long.
I tend to hop around a lot.