salam, a man wants to marry a girl, from her father and 2 witnesses, but since his mother is against marriage (the girl not from his country, and if she hears about this mariage she might die, since she is sick), he suggests that none of his family know about it, and keep it secret from his friends and family, until a baby comes in. I know his mother should not agree on the marriage as in islamic rules, and he says it is not "a secret" marriage since her family and her friends know about it, but then, he doesn't want it to be announced publicly to his friends? is it correct? I heard there is a hadeeth that talks about making a marraige public, can you help plz? is he laughing at the girl?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

If the person to whom you referred  in the question marries that girl and the marriage contract fulfils all the conditions of a correct marriage contract which are mentioned in Fatwa 92335, then the marriage contract is valid and announcing the marriage is not a condition for its validity. However, it is desirable to publicly announce the marriage as the Prophet said: "Make the marriage public." [Ahmad & Ibn Hibbaan].

Nonetheless, a man who marries a woman, without the consent of both his parents or the consent of one of them, especially if they have a sound reason for refusing, may be sinful even if the marriage contract is valid because it is an obligation to obey the parents but it is not an obligation to marry a specific woman. Indeed, there are many women and he may marry any other woman.

For more benefit on the ruling of marrying without the consent of parents, please refer to Fataawa 92340, 89650and 83379. 

Allaah Knows best.