Is an 'Urfi marriage, documented in the presence of a legal consultant and two witnesses, permissible (halal)? And is it necessary to inform family members residing abroad about the marriage, given the father's unjustified opposition, especially since the questioner has been divorced for 14 years?

Marriage without a guardian (wali) is invalid according to the majority of scholars. If the guardian objects to the marriage without a valid reason, the guardianship transfers to the judge (qadi) or the next closest guardian. Therefore, the aforementioned marriage is invalid due to its occurrence without a guardian, and the testimony of the one who conducted the contract is not valid.