Over sensitive or I should actually care ?

Kid is 2 year 2 months old. His is able to eat by himself at the childcare & at my house, but once he goes to my in law house they want to feed him. Ok is not wrong but he can eat by his own ? Is because they keep want to feed that’s why he starts to not eat by himself when his over there. Is it wrong for me to be upset at them ? Clearly I know my son is more than capable to sit down and eat without television, but because of their actions they are screwing up the things I’m teaching him. And because they are in laws it makes communication even harder. Any mums with any solution ?