I'm 27M, my sister is 31F. She wants to have a child with me. How do we approach this?

So, I don't even know if this is the right place to ask this, but I appreciate any responses.<br><br>My sister and I are like best friends since we were 7 and 9. We've always been very close. Growing up we were always best friends. <br><br>Now that we are older, we also have a sexual connection. A year ago we started having sex, and we've been seeing each other since. We are exclusive. Well, I am, and she is. <br><br>Last week she told me that, ever since I was born, she's just "known" that she wanted to have my kid. <br><br>She's old for a woman, she can't keep waiting. <br><br>I am scared about how our parents will react. They are not the type of people to know what to do with this, and will probably react badly. <br><br>I am also scared of my TRA friends. I also don't want to have a kid right now, I'm not ready. <br><br>She's convinced that we can do this, and I'm just not sure. A, I'm scared about the age of the baby's grandmother. B, I am scared about the reaction of my friends and C I'm scared about the reaction of my parents.<br><br>How do we approach this? Any advice is welcome.