What do you do.... in Bittersweet

So we took our three youngers to the movies to the morning. Now the older two want to go. Which is… well we can afford it right. But the nephews want to go. 1 my sister isnt seeming interested in giving us ANY money for the things we take them to do. Like the aquarium. And im willing to get membership and claim them on my kids so they can get into places too. But shes not willing to chip in at all. So now the nephews want to go. 1 my husband and olders want to go see either zombieland or terminator. So the older nephew can go. which means the younger boy, doesnt get to see a movie at all. And i feel god awful. I was willing to take the younger boy earlier, even though i dont think he was interested in frozen at all. But he wants to go. The problem is, my husband makes pennies a month, im not working yet, i havent found clients. So its only because we got a bit of extra money. So i cant overly afford to take an extra two kids. yes its only 20 bucks. But the kids are here all the time. I cant just “sneak” my kids out! I know they just want to be a part of everything going on. But then if T were to take the two nephews, they can only go see a little kid movie because hes not old enough to see the two adult movies that the husband and teenagers want to see!
So what the hell do I do. My sister would just tell them they cant go at all. Which i get too. Mostly because she only wants to spend her money on herself. She literally just told me she has 3 free movie tickets saved on her movie club and i suggested she take her younger boy. and she didnt respond.
my mom just kinda rolls her eyes and says yeah they will just spend the money and tickets on themselves. They never bring the kids anywhere. I rotate which kids go to the store with me. But they wont even bring them to the store. I leave mine in the car most of the time while i run in. They cant be bothered. Hell 90% of the time since ive been here, she just leaves and dosent even tell me shes leaving her kids with me. Or she leaves the 8 year old with our aging, very absent minded grandfather who is here too. The same grandfather who goes for a walk then calls me because hes lost and dosent know how to get back. Ive had to look up the street signs he finds on google maps and go find him. Hes elderly and cant be in charge of anything!

I mean clearly. T can take our two to the movies tonight. But i said keep it really quiet and not make the poor kids feel any worse for not being able to go.... Im trying to include them as much as possible. If im going for walks or the zoo ( membership) i bring them.
My heart is hurting for these poor kids who really just want some more attention and not being able to give them monetary ings to go do with my kids too....
Sigh.

I just messaged my sister and told her her younger boy is bumming not getting to go to the movies and maybe they could go this weekend or something. I really hope she does it.
My mom has made it her mission NOT to do anything because she cant afford to take the two kids. And i wont ask her to do mine too. Damn it. I feel like an ass. Sigh. I should have taken him. I know they are so bummed out.... Maybe ill go down to the red box and rent a movie or something. Thats cheap right? No memberships needed right lol. Ive never done it…