Backbiting is HARAM and we shouldn't be jealous either , I think you should tell your relatives that
The Prophet of Allah (SWT) said: Allah (SWT) the Almighty said to Musa bin Imran (as), Oh son of Imran, don't be envious of what I have given to people from my grace and don't enchant your eyes with the blessings and don't put your soul in search of them, because the envious person is unhappy at my blessings that I have distributed among my servants
The Prophet of Allah said: Beware! Don't be enemy of blessings of Allah (SWT). (He was asked: Oh Prophet of Allah (SWT) "who are those who keep enmity with the blessings of Allah (SWT)?" The Prophet of Allah replied: "Those who are envious."
"...Neither backbite one another. Would one of you like to eat the flesh of his dead brother? You would hate it [so hate backbiting]" (Surah Hujurat, 49:12)
The Prophet (SAS) has clearly stated, "The gossip-monger will not enter paradise" (Bukhari, Muslim).