I dont think sending him away from the table is a good idea, eating isnt enforced or a punishment is it? Actually the foods you say he is eating sound okay. A lot of children are picky with their food it is very common, dont make a big deal of it, sometimes anxiety kicks in when too much attention is focused on it, prepare the food ,let it be what he likes then leave him to eat it. How about his Mom takes him shopping and asks him to choose some foods he would like , maybe he could help with the preeration of the food,tell his Mom take a step back ,let it not be so important ..