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recently learned that she loaned BF the money for his housing deposit. She says he’ll pay her back.
As far as work ethic, there have been a couple of other incidents… he was working part time at a local hardware store but complained he didn’t have enough time for both work and school so he quit after a couple of weeks… yet he still had plenty of time to hang out with DD on the couch watching tv.
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Is he working now? or is he not working now because he quit his job so that he could spend more time with your DD? If so, then the concern is that he “threw away” a job when he knew he had a housing deposit to pay for. That is not only short-sighted, but kind of suggests that he “knew” he could get the money from his more affluent GF.
I think that while you may have a couple of VALID concerns, you “muddied” any possible legit concerns with statements that aren’t relevant and are, actually, ugly. As an attorney, I’m surprised that you’d make those missteps. 
If he pays your DD back, then super. If he doesn’t, then she’ll have learned a valuable (but not too pricey) lesson…and I hope she “connects the dots” that quitting a job is not a wise thing to do when a person has “bills to pay.”
As I mentioned earlier, the Grands’ opinions aren’t really relevant. I wonder why they haven’t thrown a fit that their own spoiled daughter is with a man who seems to be a complete loser.
Someone mentioned that this young man may not have been exposed to certain social skills. Well, take him under your wing! You don’t have any sons…he can be the son you never had! lol It doesn’t sound like he has a father in his life. He probably admires you and your success (except right now, he’s bruised). Time to man-up and fix that.
When your kids’ friends and SO’s respect you and like you, then they’re willing to listen to any respectfully-given advice you can offer (they may not take it, but they’ll at least consider it).
You have an opportunity to be this young man’s hero…I wouldn’t take that opportunity lightly.