Husband Dies Before Consummating the Marriage
Question :

If the husband dies just after the marriage contract, but before the wedding ceremony and consummation of the marriage, does the wife inherit from him?

Answer :

The wife inherits her husband once the marriage contract took place.
However, if the man was ill – and clearly appeared to be so – when the marriage contract took place, she will inherit from him only if they consummated the marriage. If the marriage was not consummated in this case, she does not inherit from him after his death, and there is no dower, and there is no need for her to observe the waiting period (Iddah).

Chidren from Previous Marriage
Question :

If a man is married to a woman who has children from a previous marriage. Do they inherit the man when he dies?

Answer :

They are not entitled to inherit from him.