Why can’t people respect me and my wishes?

Every time I post something about my child, his sister always says she’s gonna do it anyways. Like I shared a video of a family that lost their baby to a kiss. & I wrote a caption “Stop Kissing Babies. Do not kiss my baby”

She said commented “I’ll go get all the test you want done. I’m going to kiss her. (At least her feet).” That’s not her exact words but how she put it. All I commented back was “😒”

I just feel like every time I say don’t do something with child someone says “I’m still going to.”

Do I have the right to be mad?

Is kissing the feet a good area to kiss? I don’t want ANYTHING TO HAPPEN TO MY BABY!!!