It is parents self acquired property
they can call upon son to vacate portion of house in his possession
3) they can seek police assistance in evicting adult son
4) if police refuse approach senior citizen tribunal and seek court orders to direct son to vacate portion if house in his possession
5)While an adult son has no inherent legal right to reside in his parents' self-acquired property, the parents can't arbitrarily evict him without following legal procedures.