What should one do in this case?

Consider a non muslim couple…wife decides to embrace islam but husband and child do not and continue being non muslim.

or
husband decides to embrace islam but wife and child do not and continue being non muslim.

What should wife/husband do in this case?

Re: What should one do in this case?

My understanding is this.
If it is a Christian/Jew couple and the man converts , he can stay married to his wife as Islam allows men to marry women from people of book. It is different for a woman, she cannot stay married to a person belonging to people of book other than a Muslim.
For every other kind of non Muslims the marriage becomes void the moment one of the spouse accepts Islam.

Re: What should one do in this case?

^in addition to this, if they both convert to Islam then they don't need to get married/nikah again.