I have dd 16 and ds 14 so the bickering is years gone (well in some ways but they sort it out themselves now).
I also have ds8 and often wondered if I should have had "just one more" so he had someone closer in age to play with/grow up with etc.
I have my 6yo niece here too today and THEY HAVE NOT STOPPED BICKERING!!!!!!!!! Over everything, we have been out to a farm, we have had a picnic, we have been in the car and are off swimming - they have been entertained all day really and omg they argue over everything.
I think I was right to stop where I was.
Any 2 year age gap kids that dont fight like cat and dog?!?!?!