Organic eating

Okay ladies, I have a 6 month old and I have recently been thinking I do not want to allow him to have sugar. By this I mean like candy, snack cakes, cokes, sugary fruit snacks and so on. However I feel like I may have issues out of family members when he’s a little older and can eat these things. I myself have been trying to stay away from these things so that I can lead by example. Does anyone else follow by this and if so how do I go about letting family members know that he won’t be allowed any without coming off rude? I have a feeling some will try and TELL me how to take care of my child but I feel like for his health and any future children that it is what’s best.