So BF wants to take the family to Disney this year again. I, on the other hand, am very hesitant to spend that kind of money again. Why? Well let me tell you...

Last August we took BF's kids (7 1/12 & 8 1/2 at the time), my son 12 and my son's friend; paid for everyone. Everyone knows how expensive Disney is, right? My son and his friend had a good time, went on a bunch of rides...ya know.
The BF and I took the kids and planned out the day. On the way to the first ride (I think Alice in Wonderland or Snow White)girl8yr old says " I don't want to go on this ride", to which BF responds "We are going on all the rides. You have to at least try", to which girl8 responds by whining and crying. So I step in and say, "If there are rides that you absolutely do not want to go on, you don't have to, if it scares you then tell us and you don't have to go." I tell BF that it's not right to force her into going on rides if she doesn't want to....little did I know that she wouldn't want to go on anything but the DAMN TEACUPS!! Are you f-ing kidding me?? I was all over that park when I was that age, going on every ride I could get my little butt on!!
Anyway, she decides that she'll go on this first ride with us....and as soon as we get in the little cart.....SHE STARTS SCREAMING BLOODY MURDER!!! This is almost a nine year old girl on a kiddie ride! She was like this ALL day!!
Now, his son 7yr wasn't quite like that BUT he only wanted us to do what he wanted to do, he didn't care about his sister or anyone else...and proceeding to throw a tantrum whenever we told him we would do something else BEFORE going to do what he wanted to do.
I told BF that I did not enjoy myself at all and that if we wanted to have a good time there, we would need to come without the kids.
So does anyone understand my hesitation in dropping a load of cash a year later??
We had planned earlier this year to go just the two of us...last week he tells me his 'plan'. His plan included us going one day, staying in a hotel, and having his mom bring the kids up the next day. So his brilliant plan includes paying 2-day admission for us, paying for the two kids, and his mom....I'm not sure if my son wants to go yet...I don't think he will because he gets embarrassed and frustrated by the kids' behavior. This will cost us close to a grand!!! We don't have that kind of money! We are still in debt from his divorce because he allowed that freaking HarpieBM to take him to the cleaners!
I brought up my concern to him and discussed it which led to an argument. The following day I said, "Ok I see that you're not taking No for an answer so if the kids behave the way they did last year...their allowance is ours until they pay for that Disney admission".
May I just add that when my son was younger I took him everywhere, including adult theme parks like Magic Mountain, and I never had this problem with him.
Do you think I'm being too harsh? Is it fair to ask for allowance in order to pay for their admission if they decide to be stinkers this year again?