The agriculter land cannot be attached in Sarfesi act under section 31 of the act since there is no agriculture loan on the agriculture land it cannot be attached to recover any commercial loan.
Further since.the sarfesi act doesn't define agriculture land the meaning of it has to be deduced that the land used for primary activity of the cultivation cannot be attached for recovery since there is no direct mortgage on the agriculture land your father is guarantor the bank cannot attach the agriculture land.