Partition issues

My grandfather had a son A and relative orphan boy B was also taken care by him equally. As they grew up together it was all family earning together they have purchased an property in 1929 but my grandfather has purchased it in the name of bought up orphan boy B. Later A and B were in good terms like brothers they had there family . A had a son (me) and B also had a son (my cousin brother). And after grandfather demised, my father A and my grandmother had pledged half the property for some loan amount to a person and that is been registered in Dublin registrar office. That is the only document I have to say we have hold on property. There after no partition but by cousin brother cheated my father and when my dad was drunk he has made small portion of property sale deed toy dad's name. Which is just 5% of the whole property. Now my cousin brother started to build in that property , then I was forced to go legally stop him from construction but by then he had bought caveat. So now they have constructed half the property but case is going on .. it's been close to 7 years now. They have money and strength so buying our lawyers each time.. so please need help