7 year age gap between oldest and youngest? - how was it for you?

I have 2 girls aged 7 and 3.5 and I'm due with my next baby (team green) on Halloween! My dream has always been to have 3 kids but my in laws keep telling me I need to have another to "make it even" because this baby will feel left out or my oldest will since they are "sooo" far apart in age 😢