Outside of our two nieces and nephews - due to space we are not having kids at our wedding. We both come from large families who assume kids are invited. Should we call them up or send them an email letting them know that unfortunately due to space we had to limit the guest list and outside of immediate family children are not invited, or do we just leave it at putting 'Mr. & Mrs. Doe' on the invite and assume they get understand it from there? Note: We sent out STDs addressed to 'Mr. & Mrs. Doe.' Had we invited kids it would have added an additional 40 to our wedding.