epic fits

My 15 month old throws GIANT tantrums when we are done feeding him. If he gets a handful of puffs as a snack or when it comes to feeding time he screams and throws himself on the floor when there is no more. He ONLY does this for my husband and I. When daycare feeds him and they are all done he is fine. If someone babysits and feeds him he is fine. I don't get it. I pack the meals so portion sizes are the same. What. The. Heck.