Quick question

Soo, this question might sound ridiculous, but it might sound that way bc i was raised differently. Anyways, let’s say you have a child that is brought into a new relationship, question is, at what age do you start letting the daughter sit up front while the girlfriend sits in the back? The way I was raised is the adults sit up front. Like always usually my dad drove and my mom had shot gun, but now with everything changing and my what not, I’m not sure this is normal. So the question is, would you let the child do this or not.

So I made this post to prove a point to someone else lol I know common sense to me and probably you, but men are different so yeah of course I’m going to save this for when i need it. Thank you for your feedback.