Facts:
Three stepdaughters - 16, 14, and 11 (I also have two sons - 17 and 14)
50/50 for the three younger kids (DS14, SD14 and SD11) in the summer, the two older ones are with us full time (DS17 and SD16)
Schedule for DS14is EOWE (with his Dad) when school starts next week, stays 50/50 for SD14 and SD11
Husband pays CS (when there shouldn't be any)
Mom just moved in with her BF who lives 15 miles south of us
It's not a straight shot drive - it takes 35 minutes to get to her house
Kids are still going to the same school in our school district (note: we moved 2 years ago to be closer to her and to be in the school district)
Mom just got a job closer to her home, meaning that she'll have leave at 5:45am to be able to drop the older one off in time for school
My issues as of late:
This summer, since she's moved, she drops the girls off almost every morning on *her* weeks (she still works near our house) - doesn't ask, just does it. It's after my husband and I go to work. My husband complained to her that we don't buy enough food for them on *her* weeks (true) and her solution was to send them with lunch.
I complained to my husband that they still are eating snacks, drinking the last of whatever is in the refrigerator, using our utilities, messying our house and more importantly she didn't actually ask if it was OK. My husband doesn't think it's a hill to die on, so he just let's them come.
I finally put my foot down yesterday because no one would be home to watch the youngest one because the older girls had softball tryouts at school from 12:00 - 4:00. Her response was "She'll just have to go with them to tryouts." My husband told her "no way". Well, guess who showed up this morning
anyways.

My other major issue is her expecting SD16 to drop off the younger two after softball games/tryouts/practice at
her house. Mom simply goes home and then tells SD16 to drop them off. So she has to drive them all the way to her house and then back to our house. We, of course, pay for SD's gas. She spent $180 last month in gas. That's quite a bit for a 16yo.
My fear is this. I have a feeling that my SDs are going to be spending a lot of nights at our house once school starts - the same way they are spending a lot of days there - when they aren't even supposed to be. The other option is that she'll expect my SD16 (or husband) to do the driving. Which isn't fair to SD16 - that's an hour there and back after she's gone to school all day and then to practice. My husband also doesn't need to drive all the way down there.
It's the pattern though. It's WHY we moved to be closer to her.
The Mama of my stepdaughters suffers from BPD. She struggles in boundaries and with a certain entitlement. I do believe that her intent isn't to bust boundaries and to treat our house/our money/our time as a free-for-all.
I'm struggling in what's the "right" thing to do. Money is a major issue for me. We've both agreed to both of our older children switching to full time
with no alteration in child support. So I'm basically being underpaid and his ex is being overpaid. My sanity is a major issue for me. Five kids is a lot of work. Four of them are teenagers. I might lose my mind.

I want the kids to feel like they can come to our house... . but I also just think she should not alter her life (by moving) and her solution to her having her kids taken care of is to just drop them in our lap. The younger girls also really like the 50/50 arrangement - the relationship with their mom is relatively good.
I'm trying not to make it all about me and my stress levels, but it's causing a lot of conflict in the relationships with my husband. SD16 and I seem to be on the same page - she's tired of picking up the slack too. She said this morning "Mom needs to take care of this" as she took her youngest sister to school registration - only after mom agreed to take care of it if my husband took care of the older two (which he did). She said she couldn't get off work.
I'd like to approach it in a calm, cool, rational matter with my husband and get it resolved.
He tends to just ignore the problem and hope it goes away. I'm not sure he's even realizing *a* problem being that he's not really being directly affected.
*I* feel like we're enabling some behavior and it needs to get nipped in the bud.
Or maybe he's right. Just let the kids do whatever and roll with it?
I just think that if the schedule needs to change to accomodate the move, lets get the schedule changed and
talk about it. This current situation is not working for me.