We have the same, only we also have 'on your knee Daddy' too. I'm not so willing and usually just put some on his spoon then hand in to him or put it in his bowl loaded so he can pick it up. Often it is when he is tired. However after he ate really well when we were on holiday - lots of restaurants with booster seats, we figured that he is often just too low to the table, so it is hard work scooping the food up himself. So with a shallower bowl, and strangely normal tablespoons and big forks rather than teaspoon-sized toddler ones we have had some success. But, since there is the combination of Arwen being fed, sometimes tiredness, and sitting on an adult chair, we still get asked, and although DH gives in, I just tell him he must be finished if he complains - if he is still hungry (and DH is not there) it works.