Any one has grandparent as caregivers and they are totally spoiling your kid

My girl is taken care off by my parents since young. Although i do send my girl to child care since 18 mthsz, my parent (who doesnt approves my sending her to child care) will pick her around noon since they doesnt like her to nap in school. I dont approve ipad (i even not let my girl see me using phone), but my parent introduced it to her. I limit sweets and chocolates, but my parent let her have whenever she wants I tried talking to my parents abt it and even had conflicts because if this. Anyone had the same issue? How do you manage it?