I understand what your saying bro! I know how that life is myself. Don't have any grand kids yet! And better not 4 awhile!! Lol.. me & the wife have to "make time" for ourselves! We tell the kids to pop a movie in & we go to the "bedroom" and have our alone time.
even if its just snuggling, or snooky, or watching a flick on da tube, whatever. I got to my breaking point about 2 yrs ago, and we had to come up with our "alone time"..
and the kids KNOW not to mess with me & momma when the do not disturb signs on the door knob..
The oldest is 17 & the youngest is 8! Big age diference and trust me bro, all they do is fight!! So I do know what your going through.. your not alone. I would make a "night" yalls night! Where its just you & the wife.. get an older kid to watch the younger one/ones..
haha..