What Alex said makes a lot of sense. I doubt that there's a "supposed to" for 2nd marriages, but if that's what his friend wants, then that's what his friend wants, I don't think it really matters whether it's "traditional" or not. But it's best to be up front about the financial aspect of it and make sure everyone's on the same page.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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