Criminal breach of trust

A lends to B under a loan agreement for B's daughter's education purpose where B's son is witness. However, B is not repaying loan back and B's family i.e. herself and her husband are harassing A when talking about loan repayment since B's daughter got a good job now. Further, when seeing bank account of B it is seen that not all amount of loan is utilised for B's daughter's education as B spent for other purpose also. So A is thinking of filing FIR for criminal breach of trust against B and her daughter. What other actions can she take against B's husband and her son. Please mention sections of IPC if possible.