My eldest DC is a fussy eater - only like a restricted number of mostly fairly bland, mostly highly processed foods. I don't know if its severe enough to qualify as ARFID but I certainly recognise elements of it in his relationship with food.
My youngest is pretty average - he'll try a much wider range of foods, though given the choice he'd generally prefer the beige meals that are the only things my eldest will eat.
I find it really hard not to end up serving meals that meet my eldest's needs but mean my youngest is eating a much poorer diet than he otherwise would.
I find it really demoralising and I feel like we're stuck in a endless loop of pizza, nuggets and plain pasta and I don't know how to create better mealtimes. Help!