In The Name of Allah, The Most Beneficent, The Most Merciful.
No, you didn't become one of those who consider the haram halal. What you did is, you lied. More specifically, you lied to reconcile between you and your uncle. In that case, lying is permissible. The evidence for that is found in the following hadith.
Humaid b. 'Abd al-Rahman b. 'Auf reported that his mother Umm Kulthum
daughter of 'Uqba b. Abu Mu'ait, and she was one amongst the first
emigrants who pledged allegiance to Allah's Apostle (may peace be upon
him), as saying that she heard Allah's Messenger (may peace be upon
him) as saying: A liar is not one who tries to bring reconciliation
amongst people and speaks good (in order to avert dispute), or he
Ibn Shihab said he did not hear that exemption was granted in anything
what the people speak as lie but in three cases: in battle, for
bringing reconciliation amongst persons and the narration of the words
of the husband to his wife, and the narration of the words of a wife
to her husband (in a twisted form in order to bring reconciliation
And Allah knows best.