L.A.
I thought about this a lot last night and I wonder if you made a deal with her?
When my husband and I wanted to get married we were very young.
We met with his parents and explained we wanted to get married. Their answer was "we do not give you permission." We told them "we are not asking their permission are just informing you." They said,": well we are not helping you." We said "we are not asking for your help." They said "we are not helping pay for the wedding." We answered, "that is fine, because we feel if we cannot afford to pay for our own wedding, we certainly cannot afford to be married. "
If your daughter cannot afford to pay for her way to get up and back, to stay there without the financial help of this young man, his family, her parents AND Pay for HER OWN health needs, she cannot afford (emotionally and financially) to go up there. She is not a true grown up until she can support herself.
Maybe it is time to have her prove she is an adult by doing what the rest of us do. Work, save and pay our own way. She should be a little embarrassed, that they are willing to pay for her visit, because they know she does not have her own money. I know I would have been.
I prided myself on the fact, that I did not need help financially from anyone. This made me take responsibility for my choices. It also gave me power, because I knew I could leave or change my plans without feeling any obligation.
Just another thought.
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Would it make more sense for his mom to pay for him to visit at your home for a while? Maybe he could stay 2 weeks.. Since he does not have a job, maybe you could think of a project for them to work on for you..
Get to know him while keeping an eye on them.. Also he can see what is necessary to care for a diabetic..
Get him to meet all of your friends relatives.. etc.. make him feel the love of and smothering of a close family.. hee, hee..