Is it legal to marry my step mother's sister's daughter

Sir in India, under the Hindu Marriage Act, 1955, marriage between certain relatives is prohibited. However, marrying your stepmother's sister's daughter is not prohibited under the act. Since she is not directly related to you by blood, there are no legal restrictions against such a marriage. However, it's always advised to consult an expert lawyer to confirm that there are no local customs or additional restrictions that may apply. For further legal assistance contact us on our helpline number.