What is the شرع's (Islamic law's) view on the conduct of a husband who divides his limited income between his religion, his family and their home, and his maternal uncle, amidst war conditions, and given that the quarter allocated to the family is insufficient to meet basic needs, and his refusal to have more children due to the financial situation?

The husband is obligated to provide for his wife and children adequately, covering food, clothing, and housing. This takes precedence over providing for other relatives. The one-quarter of the husband's salary you mentioned is an additional matter not related to the basic obligation of maintenance. As for the wife's medical treatment, there is a difference of opinion on this matter, and the most sound view is to consider the customs and traditions of people. It is good companionship for the husband to pay for his wife's medical treatment and her nutritional needs. Dialogue and understanding are advised, as well as comprehending the economic circumstances the country is experiencing.

It is not obligatory to eat meals with the husband's family, but it can be a cause for fostering affection. Procreation is a right of both spouses, and it is not permissible to prevent it without a valid excuse, nor out of fear of provision. However, it is permissible to temporarily postpone it due to difficult living conditions resulting from war or security instability.