PPL telling you how to raise your baby

amy • 2 kids,1 angel baby,#3 on the way married 11 years

I hate when my in-laws nd my family keep pushing on me about feeding my son solid food his 4 months nd a full on breastfed baby. when I would go to visit my sister every time when I say every time honey I mean every time, she always say give him some food give him a taste I would tell her over nd over no I'm waiting till he's 6 months she catches an attitude like its her son it's getting to the point I don't want to go over her house an more. How should I tell her in a respectful way to stop telling me to feed him?