All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
You did not clarify to us exactly the terms of the agreement which took place between you and your husband upon which the pharmacy was opened. We do not know whether you agreed with him to work in the pharmacy in return for a determined salary, or that you agreed with him to pay you some money in return for registering the pharmacy on your own name, or that you did this for free. No appropriate answer could be given without knowing the terms of the contract.
In case the contract was about a specified salary in return for your work in the pharmacy, then your husband is obliged to pay you a salary, and you may do whatever you want with your salary. The best thing on which a person may spend his money is in keeping ties with kinship above all the parents.
However, if the agreement was that your husband would pay you some money in return for using your name (in registering the pharmacy) without you working, then the matter is renouncing one's right in return for the money. You have the right to open a pharmacy because you are a pharmacist. Therefore, if you renounce this right for another person in return for money, then the scholars differed in opinion about the permissibility of exchanging rights. If we say that this is permissible, and this is the view we adopt here in Islamweb, then the husband is obliged to pay you what you agreed upon because the pharmacy is registered on your name. However, if you volunteered with this, then you are not entitled to anything. Similarly, the husband is not obliged to help his in-laws [the family of his wife] unless he does this out of a good act from him to them. It is reported that the Prophet said: "The best reason for which a man should be honoured is his daughter or sister (i.e. to be one's wife's father or brother.)." [Al-Bayhaqi].
Allaah Knows best.