According to the Women's Charter 1961, under Section 64, you can file a Personal Protection Order in Singapore against a family member. This could be:
a spouse or former spouse
a child of the person, including an adopted child and a stepchild
a father or mother of the person
a father-in-law or mother-in-law of the person
a brother or sister of the person
any other relative of the person or an incapacitated person who in the opinion of the court should, in the circumstances, in either case, be regarded as a member of the family of the person