Right of illegitimate son on fathers self acquired property & benefits

SIR, MY FATHER IS WORKING IN STATE GOVT EMPLOYEE MARRIED MY MOTHER HAVING TWO DAUGHTERS ME MY SISTER BOTH ARE MARRIED. MY FATHER IS HAVING ILLEGAL RELATIONSHIP WITH A LADY AND HAVING ONE SON AGED 21(UNEMPLOYEE). IN THE MEAN WHILE MY FATHER ADDED HIS NAME IN HIS SERVICE RECORDS AND PREPARED EHS CARD TO HIM. THE SAME HAS BEEN COMPLAINED TO CONCERNED AUTHORITIES BY MY MOTHER AND MY SISTER. GOVT ACTION IS ALSO ON PROCESS. MY QUESTION IS MY FATHER IS HAVING PROPERTY OWNED BY HIM. DOES HER SON(ILLEGAL) HAS ANY RIGHT ON MY FATHER PROPERTY AND FUTURE PENSION BENEFITS OF MY FATHER.