What is the ruling on marriage if one of its conditions is not met, and is it a condition to write and register the contract, and is it a condition for the groom's family to know about the marriage?

The conditions required for a marriage contract vary in importance: Offer and Acceptance are essential for the validity of the contract, and their absence invalidates it. The condition of the guardian (wali) is disputed; the majority of scholars hold that its absence corrupts the contract, unlike Abu Hanifa. The condition of witnesses at the time of the contract is also disputed; the majority of scholars do not consider a marriage valid without them, while the Malikis consider it valid, with the recommendation of having witnesses at the time of the contract and their obligation at the time of consummation. Writing and documenting the contract are not conditions, though they are better for safeguarding rights. Similarly, the husband is not required to inform his family of his marriage, though doing so is better to prevent discord.