If your BM is a total failure at life, she is likely jealous of SDs' prospects of a successful future. Of course your SDs cant be better than BM, so BM is going to guide them down paths of minimal success, young parenthood, and living off the backs of government welfare and baby daddies. 

succeeding.

If her DD's want to be SAHMs. Great, but, my money is on BM undermining the goals of the SDs.

You and their father need to shred BM for this and keep those young women on a path to their own goals rather than giving up on those because their BM is an idiot.

Not that there is anything wrong with being a SAHM mom. My own mom was a SAHM, she and dad have made a great life together, have a nearly 61 year marriage (and still going), and is an incredible person in her own right. Her DH, her sons, her GKs and my DW would agressively disagree with anyone who took the position that she i anything less than an incredible person who has lived an amazing successful life making a family, building a country, and creating amazing art.

One thing my mother has never done is try to undermine opportunty for her boys.

BM in your situation is a POS.

I hope your SD's can know that turth and avoid her path like the plague that she is.

Though they can certainly be indeptendent and have children. My DW certainly has.  16 & Pregnant, Single Teen Mom, dual major BS with honors, MBA with honors, a thriving career as a CPA, successful marriage (nearloy 29yrs), and faised a man of character, honor, and standing in his profession and community.

I do not get BM's perspective of her daughters not being independent and instead having children. Unless this POS BM wants the breeding for dollars CS and Welfare that advising her daughters as she has very well might result in. Keeping her daughters breeding and dependent on BM .... sounds like a multigenerational entitlement breeding money grab.

Time to emphasize the fact that independence is freedom!

Well since most GUBM’s see their daughters as an extension of themselves and not a separate person BM probably assumes that all her daughters want to do is be a baby factory like she wanted to be and live off a man. 

Who the F says that??! Stupid. Hopefully they don't take her seriously. 

WHAT?!?!

I tell my kids all the time that I don't regret anything about my life with their dad and they were so wanted- but don't be like me! Don't get married at 19 and have babies at 22! Be young, get through college first, live your lives selfishly for a little while!

I'm convinced that some people are just born without vision or ambition. And it makes them uncomfortable to see other people pursue anything "better" than the status quo because they perceive it as threatening. My SDs' BM has actively tried to sabotage her college education since day one. Literally bending over backwards to engineer a situation wher OSD would stay home, work a minimum wage job, get married before she was 20, and start having babies. Because that's what BM and her entire white trash family did. I'm like, lady, you are miserable. You've been miserable for at least the 15 years that I've known you. WHY would you want that for your children?! It's crazy to me. 

I've told both skids to not have kids young and live your life first. Finish school, get a career, go travelling, meet new people and learn about the world. 

BM had SS and SD at 19/20 and lives off single mother welfare relies on CS. She will push SD to do the same. Poor SD won't have a chance of being independent and successful with a narcissist as a mother. Anything SD does that BM finds threatening to her she will trump. 

In whatever order works.

Or better yet, in parallel.  School, kids, career, travel, expat assignments, etc.....

Why leave anything on the table in life? Eat it all.Voraciously.