Addressing wedding envelopes for the family only (without girlfriends)

by sandi
(scottsdale, az)

I addressed wedding envelopes to "The Stewart Family" and the "Rombard Family" assuming the recipients would understand that I only want to invite family members of that household---not other guests. Yet, I received phone calls asking if my invitation included "girlfriends" to the Stewart Family's teenage sons and girlfriends to the "Rombard Family's" teenage sons. Did I do something wrong?

I was surprised at the reaction. Is there a better statement I could have used or was this acceptable? This was a second marriage and I didn't want people to feel obligated or uncomfortable with having to think about a gift.