I think that is possible in theory, but in practice using coerced or pressured testimony of one immediate relative against another might not be used much and perhaps restricted to high level terror charges.If Cranston actually did confess to the killing, I'm sure LE and the DA would want to question this daughter and other family members and possibly even charge them in connection to the killing (a way to make them testify for the state)
In the end, the chances of pressured or coerced testimony against another immediate relative going "off rails" at the trial might make prosecutors leery of using it.
My guess is that if the prosecutor uses the testimony of a daughter or other family member, the person testifying must be willing to testify sans pressure.