While I was working , my MIL was watching my 2 month old son. I specifically asked her to put no rice cereal in his formula and she said ok. I get there to pick him up after work and she tells me she put rice cereal and corn syrup in his bottles of formula. I said “I asked you not to do that” and she said “I’m going to feed my grandson how I want, he’s hungry” then she laughed at me. How should I handle the situation / what would you do?