To move or not
You do need advice — and here it is: Your woman’s intuition is telling you this isn’t right, and that your boyfriend can’t be trusted to fulfill his part of the bargain. You should listen to it because that’s a poor basis for uprooting yourself and becoming his benefactor.
The person you have described is someone centered solely upon himself and his own needs. A man who doesn’t make you feel special, wanted or important would make a very poor husband.
I do agree. And for that reason, you should discuss this issue with an attorney who specializes in estate planning, wills and trusts. Your other daughters should not suffer because Lauryn and her husband have been perpetually needy. An attorney can guide you, and it will be money well spent.