When did you start giving you baby table food?

My lo just turned 5 months and I’ve started to introduce purèed organic babyfood. Not a lot a bit here and there. Anyway my mil keeps suggesting I give him instant mashed potatoes (and cereal in his milk at a week old) and gravy and not the puréed fruits and veggies. Ive tried explaining that I don’t want to because it’s starch and will turn to nothing but sugar and im trying best to keep him healthy. I had gestational diabetes and his grand dad has diabetes and I’m just trying to lower his chances with a healthy start to life.