Mmm... It seems everybody is eating soup these days! And homemade, no less? Campbells, has always been a go-to staple, for me. I even like the condensed kind, or whatever it's called - that you have to add a can of water to... (those are especially good, come winter!) :^)
I'm sorry your kids are so disrespectful living in your own home, but I'm sure they take things for granted, because you are probably just too "nice." I get it, it's sometimes easier to avoid conflict--& especially if you fear the consequences on the other end of a different harder line/or stance, decision. Also hard to do, suddenly "switch," up (gears) like that - if it's not something you've always done. For then they are therefore not accustomed to it, & it will be, or seem totally out of character. They may laugh you out of the room, or not take you seriously.
But that said, you could accomlish the same thing, a break from them & their living arrangement, short of "kicking them out." If you got another place across town/or the city. You know whatever seems reasonable, or feasible. A tiny little studio, or whatever. That achieves the same goal. Maybe have them chip in a little bit, and put that towards your rent? As for the (other) guy you're considering marrying. Maybe easier to manage if you break it down and simply it? First off, and for starters - Do you want to live with him "Period?"
In other words, here / there / anywhere in the Universe? Once you've answered that, then it may seem just a little bit easier to decipher where you want to live. That sounds like more of a logistical problem, in my estimation. The bigger being, the former. . . I do wonder, and this is me just spitting out sounds out loud, so I hope not to offend. How much does someone who potentially is going to be your Spouse, really want to get married to you, if he can't be bothered to upgrade his tax situation? Not a fair question, perhaps & maybe. I don't know the particulars, the details, the accents & what have you. Etc~.
If that amount of money, the difference, would wreck his life, or alter it in such a way that he would have to make too many compromises, or if he just doesn't like where you live. Then I'd suppose those are reasonable things that should be considered, and weighed appropriately, and accordingly. It's just that in my eyes, which are not his, or yours. If I was in that situation, that's not the sort of thing that would put much hindrance into my efforts to get hitched, or whatever, so to speak... Hopefully, I've not over-stepped my bounds, or boundaries. For I am only trying to offer an alternate perspective. Whether or not it is any good, is ultimately up to you,
@Lane.
post script: you could make it a whole lot less confusing, or ambiguous if you'd treated them like more grown up adults who should, and need to take care of their own responsibilities (unless they already are, in which case, forgive me - I may not be fully up to speed - but even if they are does that come w/the rent? The right to live like you aren't even there? In your own home, no less?) / Again, all I do is ask the questions. You may decide what is best based on your own judgement, and seasoning to taste. For it is you, who are/or is the 'expert,' on your own life and its surroundings. I will say, from afar, you've got your work cut out for you more than most, given the "supporting actors (or players)," shall we say - in your script of a movie in this ever poor & fading analogy.
pps) I forgot to say, or mention "tomato!" controversial (selection or choice) I know...
& if they don't like it, they can leave! ;D (says the guy who can't say no to & gets "bullied," by his cat!) hah hah