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.
With regard to the money that you had given to your father to help him in building the house, as well as the money that your elder brother had given, then if this was as a gift and a way of helping your father, then neither of you have the right to ask for this money. However, if you had spent this money with the intention of asking him to reimburse you for it, then it is a debt on him and you both have the right to ask for it if you can prove this or that the rest of the heirs confirm this to you.
However, since you had renounced your share in the house in favour of your brother of your own free will and the dead did not leave anything else, and the rest of the heirs did the same thing, then you have no right to ask your brother for your share that you had renounced.
If a person deliberately renounces his right out of his own free will while being in sound mind, he has no right to withdraw his renunciation for the Fiqh rule that reads: “Once a right is renounced it can not be taken back.” Moreover, in the meaning of the above, Durar Al-Hukaam (by Muhammad Mullah Khusru from the Hanafi school of Jurisprudence) reads: “If a person renounces any right that he is permitted to renounce, then this right is renounced from him and after it was renounced, he cannot take it back.”
However, your elder brother is obliged to be kind to you in the same manner that you were kind to him and he should recompense you for your kindness.
Allaah Knows best.