When his father died, his relatives took out their wills and said that they would divide his father's house and keep the provident fund on his behalf. Is it effective?

No effect, according to the inheritance law, the property of the deceased should be inherited by the first heir, that is, the biological children. You said your aunt took out the so-called will. If you don't indicate that it is a will but only a signature, you can ask an appraiser to identify the handwriting. Of course, things like wills must be signed by notaries and notaries. If not, it's fake.