Never mind that she is feeding the older kids crap, she has given some to your son without any concern as to whether or not these foods have been introduced to him. You are lucky he has not had a reaction to anything. Tell her yes, she can feed him real food - pasta with vegetables, vegetable soups, healthy homemade casseroles, etc. A 9-month old is ready for table foods, but not processed, nutrient-void garbage. He can certainly eat bits of what you are eating - in fact, that is preferred to jarred foods - but it should be healthy.