His daughter was given POA while in coma. My fiance lives in a nursing home now but is alert and awake. His daughter says I'm not welcome to visit him there because they don't like me, but we loved together and were together. It's obvious he wants me there but the nursing home makes me leave when I go there. This is so wrong but do they have power to do this?
The situation you describe is somewhat confusing. Have you had some kind of legal/mental health/other issues that would allow your child to be removed from your care? (no need to go into details, just asking). There had to be some sort of issue raised in a court or with child protective help that they would be able to put you out of the home you had lived in for the past 10 years and to take your child so easily without a court hearing or some type of legal assistance on their part. As for getting married, it is very cheap to go to the courthouse and get married, so it sounds like you were both wanting something much more than that which put aside the marriage.
Also, do you live in a state that recognizes common law marriage? Of course you would have had to present yourself to others as a married couple, file taxes together, have bank accounts together or something that showed you presented yourselves as husband and wife. All of these things need to be addressed with an attorney.
You have asked if they have the power to do these things. Well, they have already done them. Were you served with some kind of legal documents to do what they did or did you just do as they asked...move out and give them the child? Attorney time is now - without delay - unless you already know there was a legal reason for the things they have done to you. If so, was there any kind of just cause for them to take the actions they took?
Community property states even with representing and living with over 6 months, does not protect your assets or rights. Sometimes the old ways are the best ways. Not just with assets, but with making important care decisions for him. Hard lesson but losing custody of the son is a completely different issue and one we don’t understand.