NA Responsa 10 e

Yibum

TRUE

A man is about to marry and has a brother who converted out of the faith. How does he prevent his wife becoming a yebama to his brother?

A man comes to properly marry a girl and he has a brother who converted out of the faith. The man wishes to know what to do to avoid having his wife becoming eligible to levirate marriage (yebama) to his proselyte brother if he dies without children.