She Wants an Alone Honeymoon-OPP

On Other People's Problems, a couple is getting married next month and they can't agree on the honeymoon. She wants it to be the two of them and he wants to bring additional people.

Mike & Kate-
I'm getting married next month. It will be a second marriage for both of us. I have a young daughter and my fiance has two boys under 10. We both have 50/50 custody.
We are going to Hawaii for our honeymoon. We'll be gone an entire week. This is the first time we have had an entire week to ourselves since we met. My fiance informed me last week that he wants to bring his boys on the honeymoon. Please know I love these children and treat them already as if they're my own. But I don't want them on my honeymoon. I love my own daughter more than life itself and I still would love a week alone with my new husband.
When we set the date my ex said that would talk to his ex about swapping weeks. Of course she said no, but I'm a little upset with him because he waited so long to ask. We've been planning this for months. He asked her after the invitations went out assuring me everything would be fine. So I can't move the wedding back a week so that he doesn't have his kids while we're on our honeymoon. It's too late to rearrange. We already bought the honeymoon package which is non refundable.
Now he wants to bring his sons on our honeymoon. He says since we can't get out of it, we can add people to the reservation. His ex is willing to keep the boys we are gone but won't swap weeks and my fiance says he can't go two weeks without seeing his kids and is upset I would even suggest that. I don't want to spend my honeymoon as a family vacation. We've been doing that for the last year and half that we've been dating. I want a week with him. Who is right?

Thank you