BM never let go and it's such a headache having to deal with their BS by CHOICE! We choose our DH and all the drama that comes with it.

I would tell DH to deal with the credit card and school supplies. MIL is disrespectful because she continues to feed into BM after all the problems she's caused for you ,  DH and SD.

No it doesn't end. Throw this one back. It is not worth it. 

BMs ALWAYS try to stay relevant!!! Our BM "tries to talk reason" with DH anytime 16yoSD comes home "hysterically crying" when she leaves our car perfectly fine, we have a PERFECTLY fine weekend, and end up with a phone call from BM talking about how we weren't fair to SD and SD is feeling left out, or that everyone is making fun of SD, or that we don't believe that SD's allergies aren't real, ok we DON'T think her allergies are real because shes PROVEN them to not be real. she's EATEN food that HAD her allergies in them on SEVERAL occasions, and had no reaction, it doesn't show up until DAYS later when she goes to her mom's house, but we don't say anything, other than, "SD, if you were having a reaction, why didn't you come to us? or "SD, that cookie that you just ate at grandma's house had the food you're allergic to, are you ok?". SD is 16 and is PERFECTLY able to talk to us if she feels we're being unfair, or that say that something may had hurt her feelings, or that she's having an allergic reaction.... but no, MAGICALLY, she only thinks of these things when she gets to BM's house.... and then BM can become relevant in our home, once again. She was also invited to DH's father's funeral... by SD, she was also invited to DH's brother's funeral.... by SD... So yes, BM is very much part of my life on a regular... and she's just a discustingly gross person.... and I am ONLY talking about her personality. she's incredibly dense, fake, and just makes you want to VOMIT with the way she thinks... she THINKS that when DH was so overwhelmed when his father passed and he had no time to process it and cry, that it was a good thing... that he shouldn't be able to sit, think about it and process.... I literally wanted to punch her in the face and tell her to GTFO. she didn't belong there, she never has belonged in my life and I NEVER want her in my life, she's a complete MORON, and continuously inserts herself where she doesn't belong....

Sorry for the rant, I just WISH that lightnening struck down on her and killed her.

Im lucky in that most of DH's family despise Toxic Troll BM. However she is still "relevant" because she pushed out 2 DNA samples.

I appreciate the ones that do not have any contact and really resent the ones who continue contact via social media. And like her posts and especially the BFF of DH who maintains contact via social media to the point of wishing her happy birthday.

Youd think that at least the BFF would have more loyalty. The family that stays in contact, I can see that maybe its because they think its the only way to keep in contact with Feral Forger SD22.

Im 7 years in.

You MUST create and enforce boundaries. Your husband is not having your back with his family if they are still hanging out with BM, playing "happy first family".

B!tch tried to horn in on MIL's vigil. There was a week-long vigil where she lay, the life gradually fading. DH told TT "please dont go". We were there every night, I stayed to the sidelines and helped with food, while everyone else sat with her and said their godbyes. However, she told SD15 backstabber that "she didnt care what DH said she was GOING".

Toxic Troll insisted on coming one night and then SIL had to get firm and tell her that the next time she insisted on interrupting the vigil, police would escort her off the premises.

So it really sucks that your MIL is that toxic.

Has zero value, standing, or use, and should not be tolerated. Any crap has to be met with total confrontation, zero tolerance, and an increasing state of abject misery. 

PERIOD!

The same applies to your MIL, she needs her nose rubbed firmly and regularly in the stench of her own crap .... and ... in the stench of BM's crap.  She needs to basked repeadly what she finds so valuable in BM that she tolerates the waste of skin that BM is.

Lather............... rinse................. repeat.

I'm in almost 26 years. I've been with H more than three times longer than his entire relationship with BM. Yet, H's nieces are having a love affair on all of their social media accounts with BM and now GBM. It's been recent too. H's niece actually got jealous that I'm in a long-term relationship and she's not, so to piss me off, she started reaching out to BM on FB several times a day and the two have become buddies. Then the other niece became FB friends with BM and now it's spread to both nieces being FB and IG friends with GBM. Several times a day, they all say love-dovey comments to one another. I lost my shit to H and told him this is exactly why women can't fucking stand their steps or even extended families within the in-law side. I told H that I'm so fucking sick and tired of BM never going away and people worshipping her and having love affairs with her when she cheated on H and blew the whole family up and traumatized my SKs from having crazy fights with H and trying to take the SKs away from H when they were only 2 and 4 years old. H is even frustrated that his own nieces would be so love-dovey with BM and GBM after BM blew her family apart all because she was a cheating skank. I just don't get it. It drives me insane that after 25 years I'm still coming a distant second to a narcissistic personality disordered cheating skank and I'm still not really recognized as the wife. Since I have an exit plan, I don't give a shit about what I say so I have banned the nieces from my home. I thought H would go nuts and side with them but it turns out that H doesn't want the nieces in our house either.