Similar situation here, except DH is NCP and no longer sees his daughter...sick of the BS and BM allowing the behavior and SD treating him like a paycheck only...

Be thankful she's 15 and in 10th grade...my husband's daughter is 15 and in 8th grade! And as of last semester, she was failing her english class again...if you fail english in 8th, you are held back...she's already held back one year...

She does all the other things your SD does and BM sees nothing wrong with it...DH tried to intervene, but BM hates DH so much that she defends her daughter and then tells her what a piece of garbage DH is and that she doesn't have to listen/put up with him...so DH has given up...

Texas is CS until 18 or graduation from highschool, whichever is first...the way she is going to graduate 3 mos short of her 20th birthday and that is if she does not fail this year, which I have a feeling it will happen...we'll see...

BM even allows her daughter to have her boyfriend sleep over the house...they go everywhere together even during the week...has allowed this behavior since she was 11 if not even earlier...

I don't care anymore...but DH is very clear that after he finishes with CS, if he dares give his daughter one dime, I am out and all the money I have wasted supporting our family because of the CS, etc...he will pay back...I will fight him for it...So far at least he understands this...as he suffers financially from this as well...we went from living a decent life to living in a SH#$ hole and still can't make ends meet.
Our son does without therapies so that his daughter can have cell phones, get her hair dyed at the salon, get her nails done, etc...makes me sick to my stomach...

Good luck...if I didn't have a child with DH, I'd be out by now...but I will not allow that B#$4$% to ruin my family and the future of my son because of her greediness, etc...

PS - I believe my husband's daughter's boyfriend is 18 and either a drop out or out of school...from pics he seems to be a loser that does clandestine car racing, etc...hmmm

I went thru this with my bioson and alot worse than just school issues. He also fathered a child and was arrested at 17/18. He is smart and didn't flunk out, just never went to school.
We tried to be tough on him, didn't just let him do what he wanted. Also while he was on probation, I made them put in a stipulation that he had to get his GED. He got it on the first try.
Now after alot of work, patience and tough love, he is a 25yo responsible adult. He is still with his GF and son, kicked his drug habit and has a very good paying job.

SS16 is a different story. In the 4 years I've been around, he has been flunking core classes but was passed along to get rid of him b/c he is trouble. In his first semester of high school, he flunked every class but gym. BM and SS are finding that high schools do not go in for the excuse factor. BM would use excuses like she was dying or was in hospital to keep the kids out of trouble for not going to school, or stupid stuff like SS was peeing blue so she would run to ER and get a note for the kid missing a day/s.

I recommended a boot camp for SS last summer, that would have started a few weeks ago. It is a 22 week course, they learn skills and get their GED, and he would get away from BM's crazy b/c they live at a Reserve base with other 16-19 yos.

BF just ignored me as usual. Then the kid gets himself arrested again after Xmas. BF then looks at the site I saved for him online. But the program isn't for kids to go to stay out of jail...it is for them to get a leg up and voluntary. So as usual, my advice is wasted.

I see my SS in jail in a few years. He was never taught any type of structure or values.

I would say unless your SD wakes up and wants better, she will be working at McDonalds or living on the welfare train or off you and Daddy.

My SD18 was like this but is actually improving! She went to summer school several times in elementary school - ?? yes. Then was almost held back in 6th grade?, but was able to attend summer school the entire summer and was promoted - yes.

She is a smart girl just doesn't accept authority, study or do her homework, and lays out of school for the slightest excuse. I started talking to her about a trade school, so she can support herself, but she has always felt she will graduate from college, even graduate school, and insulted that 'I' didn't think she would.? I think being a hairdresser for example is very lucrative and she would love it, but whatever.

Well she is a senior now and this is the very first year she has a report card with NO Ds or Fs. So she for the first time achieved a 2.0 but by God we are all celebrating even that! I did know she could do it, but her BM told her and the school, that SD had dyslexia, when I pointed out she could not read at 11 years old. But when DH tried to get tutoring specifically for dyslexia, BM was furious and refused - because she was lying about it, and SD went along too. Great example mom!!

But anyway, she is determined to go to college next year, and while I don't know how it will be paid for, we are thrilled that maybe it will happen. Also, and I don't know for sure this is a factor, for us child support stops when SD stops being a full time student with a certain grade average, up to an undergraduate degree. So of course we want her to go for her sake, but if she screws around, we are out.

Since DH is out of work, we are struggling to pay the high child support he used to easily make. BM lives off of child support, and is constantly hand to mouth, and there are no extras for SD that I know of, but we are not allowed to ask any questions about BM employment (which is a rocky road), because it is none of DH's business supposedly. Whatever. The point is, we think BM will make SD take out student loans to pay for her school, while BM lives on the child support, that is supposed to support the child but doesn't. Oh well, hopefully it will work out - but improvement can happen!

One more - my nephew was always sort of maybe a little lazy? and never made good grades - was happy with a C even though he is intelligent. Well his senior year, he started studying, went to a somewhat small college in a remote area, but has made the DEANS LIST every semester there for two years now. We are so proud of him, he has a new direction and honestly I believe is better away from my co-dependent SIL, and we think he may have inspired SD too. So keep the faith, it can happen!!
_________________________________________________________
“Learn by practice.” - Martha Graham

We went through it with SS, now 17. He failed 8th grade twice. Insisted on staying with BM and she is not a parent. He was basically unsupervised. Got a child in need of services petition served, which meant court. Arrested for pot possession (hidden from DH for 5 months). That meant drug tests and eventually 2 weeks in lock-down program. He finally went to a charter school and caught up to grade level. He still parties but is more or less responsible.

One core problem in DH's marriage to BM bore poisonous fruit--she treated the kids like friends and is totally inept at getting them up for school, monitoring their work, etc. DH was marginalized and disrespected although he is the one who raised those kids. BM was like another big kid--hid things from "Daddy" like all of them (BM, SS, SD) smoking. DH was the one called last "help Daddy help" He has practiced tough love for the past several years and it has helped. He fully allows them to reap the consequences of their behavior.