1) send a notice u/s 142(1)(ii) to the girl for submiiting her consent over your proposal
2) send a show cause notice u/s 144 to her father to give reason for not marrying her
3) pass the assesment order & raise demand u/s 156
4) if ur father in law does not deposite within due time, he shall be the assesse in default u/s 220
5) if within 6 years from the date of your marriage you come to know that your father in law has one more daughter then you can open the case u/s 147 for Daughter escaping marriage
Disclaimer: Person following these section in his life shall be solely responsible & the auther shall not be held guilty for anything mishappening