the are two identical twin sisters. the good sister is married with a 2 month old. The bad sisters a gambler that owes a lot of bad people. The good sister get killed by the people looking for the bad sister. the bad sister's guilt get the better of her and she refuse to leave her sisters child without a mother.
The story will play out to were the bad sister will get pregnant by her sister husband. the husband writes off her odd behavior as from her be with child. not from her being another person. that is the idea