property belongs to your grandfather, ?
you are not legal heir but your father & uncles. so the dispute is between you and your cousins ? or your father other legal heirs?
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i mean no disrespect or disregard to your father & other legal heirs, however i see you & your cousins as 2nd tier heirs, who LEGALLY have no right to occupy or encroach upon such property, it shall be disposed off to avoid any bad situation. if you have legal paper work & evidence of heirship hire a lawyer & seek injunction order.
put it as disputed property so it can not be disposed off without presence of all legal heirs of 1st tier or their subsequent heirs in 2nd tier.
5 years minimum 25 maximum it will take for court to decide., you go on with your routine and forget that property