Does the amount for which the car was sold, and the remaining amount from the valuation of the store's merchandise, fall within the deceased's estate and get divided among all heirs, including the mother and the daughter from the first wife, knowing that the wife contributed a large part of her private money to buy the car and open the store?

The first thing to be disbursed from a deceased person's estate is the settlement of their debts, based on the Prophet Muhammad's (peace be upon him) saying: "The soul of a believer remains suspended by their debt until it is paid off." After that come the expenses for their preparation (burial/funeral), then the bequests from one-third of the remaining estate. Finally, the rest is divided among the heirs.

If your loan to your husband is proven by evidence or by the acknowledgement of adult, competent heirs, then you are entitled to recover it from the estate before its distribution. If not, then you are not entitled to recover it now, but you will have a reward from Allah, based on the Prophet Muhammad's (peace be upon him) saying: "If people were given according to their claims, men would claim the wealth and blood of others, but the burden of proof is on the claimant and the oath is on the one who denies."

Whatever you gave to your husband as a gift became his property upon his possession of it, and it becomes part of the estate, to be divided among all heirs.

Finally, inheritance issues are complex and should be referred to Sharia courts, as they consider all aspects: such as the existence of other heirs, bequests, debts, or other rights that take precedence over the heirs' right to the money.