I cannot remember the actual date but there was a marriage on the fringes of my family, she had been his sister in law, they ran away to London and returned home to their small village and when their first child was born there was an entry in the baptism column by the incumbent stating it was an unlawful marriage and there fore the child was not legitimate, it wasn't that long ago, from memory it very early 1900's
I do believe in some countries the brother has to look after the wife/wives of a deceased brother, even marrying them, increasing his wives, recently on TV
Louisa Maud