My grandfather passed away yesterday while my sister was supposed to get married next week. I want to know if it is allowed in Islam for the marriage to continue as planned?
It is allowed and he would probably be happy about the marriage, however, it is understandable if the family wishes to postpone it. Also, some cultures have viewpoints about these things (which are not specifically prescribed by Islamic law but could be taken into consideration although it is not required to adhere to cultural viewpoints).