Is it permissible to secretly marry a Muslim woman without the knowledge of her family, due to their disapproval of their son marrying a Muslim woman, given the son's desire to invite them to Islam?

There is no harm in this marriage if its conditions and pillars are met, namely, a guardian for the woman and the presence of two witnesses. There is no objection to keeping it secret from the family for a long time and then informing them. However, if the intention is to marry with the intention of divorce without specifying a duration in the contract, the majority of scholars consider the marriage valid, while the Hanbalis prohibit it.