could someone with a legal background go over, for those of us who are first generation emigrants/kids of emigrants what major areas to be considerate of when getting legally married

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some i've thought of

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if you don't have marriage contact you can't have spousal visitation during end of life

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it's also unclear (maybe at a state level?) if I live together with a partner, without being legally married, what liabilities I have. Is she still entitled to half of what I have in assets? The house? How would child visitation?

What are some larger areas here to think about? Thank you.