My Uncle Wants To Rob My House

In 2013, we lived in a house behind my godfather's land, my parents saved money to put a down payment on a house elsewhere, and he didn't want my parents to leave his house with two small children (me and my brother).

So that was when he gave up 6m of land so that we could take this saved money and build our house (we have a signed paper saying that he gave the land). After a lot of hell he did during the construction, for example, paying the builder to harass my mother, locking the gate of our house so we couldn't enter, slapping my father three times on the chest, in short, we entered and have lived there ever since.

Last year he took our IPTU and said he "paid it wrong", and my mother paid him on pix. Now, this year, he said he would pay the IPTU because the land is his. We're afraid he'll try to get us out of here, and we don't have money for a lawyer. Any advice?