Need to take the paperwork to a local experienced probate lawyer to review. If it has not been sold, then if You have a life estate you can stay there.
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If you don't have the agreement in writing, you will most likely have a problem enforcing the oral agreement. As a life tenant, you can prevent a sale of the residence. Perhaps you can use that as a bargaining position to get your brothers to reimburse you, since they can't sell the house without your consent and participation in the sale. There is your leverage! Alternatively, you can commence an action against them seeking to recover the funds you expended for improvements. Look at the deed to the property and see what life estate language is spelled out in the deed to determine what your obligations are as a life tenant. Hope this helps,