ground hog day

[micko and jack]

hi everyone you probably thing i read this before

i had a cock 14 years old that died aprox 3 weeks ago  leaving a spare hen the cock in the next nest box who is down on eggs got up on the spare hen and now she is down on one egg sittting on it herself i locked the cock and hen (pair) in there own nest-box with their own eggs should i

A leave the hen on her one egg

B smash the egg and get a cock

thanks for any help micko