Should my mom have more children?

My mom is 38. She has 6 kids. Brandon is 17, Lil is 16, Willie is 12, Marie is 9, Luke is 8 and I am 6. (sigh please dont make stupid comments. Brandon is helping me type.) My mom and dad sat us all down to ask what we thought about having another kid. I think it would be fun since I am the youngest but the kid would have a 6 year age difference. It would feel left out. Anyway, what do you think?