Let them get used to varieties of foods/tastes and make them somthing depending on their age and give them a chance to get used to different flavours and ways that they can be cooked always give a variety and give them a chance to get used to it

My kids were very fussy with food once they knew what they liked/disliked. The advice was make your dinner usual ( eg mashed potatoes, rive , pasta, vegies ) are great for everyone and then just let them taste a bit of everything . If cooking meat you may have to mash it up a bit ( blender or fork ) as they can be tough to chew so always make sure nothing is too hard for them to chew/eat.