It was my understanding that dower rights supercede the mortgage, and the wife gets a life estate in 1/3 of all real property in her husband's name at the time of his death.
I have a copy of an opinion from James Conboy (at the time of Simpson & Moran in Cheboygan) dated 6-5-87. Jim sent the opinion, which deals with signature requirements under Regulation B, to the FRB, the FDIC, the OCC, and the (then) FIB - as such, I think I can share it with you. Just post your fax.
The opinion was published for banks in the old BCLA News, which is now the FICC. If you're a member, ask Cathy Riley for the article from News 87-6, page 5. Jim also references state law at MCLA 558.1 for dower rights.
The pertinent info in the opinion: There's an exhibit attached that the wife may sign, waiving her dower rights. This may be where your management is coming from.
Caveats: I'm not an attorney, and I'm not a dower rights expert.
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Opinions are Bartman's, not those of my employer. "A noble spirit embiggens the smallest man."