I think it's rude to show up with an additional child who is not in invited. It can cause problems for the hostess if she has created a certain number of goodie bags, if the venue charges more for additional children, having enough food, etc. However, if you call the hostess ahead of time and explain the situation, letting her know that you don't have childcare for the oldest child and would have to decline the invitation for the other child, she may try to accommodate you so you don't have to decline altogether. I've had moms call me with this problem before when I was the hostess and if they call ahead and I have time to prepare, I'm happy to oblige.
Generally I feel that the addressee on the invitation is the one invited. I'd never assume the hostess meant all children in the family if she addresses it to one particular child.
Last edited by gatorsmom; 08-20-2014 at 07:16 AM.
" I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent." Mahatma Gandhi
"This is the ultimate weakness of violence: It multiplies evil and violence in the universe. It doesn't solve any problems." Martin Luther King, Jr.