Hello,
1) If she files rape case out will not stand as it has to be proved. If she does file a case or a police complaint you need to defend yourself.
2) Even if she files for evicting you her chances of succeeding is slim s you have been in continuous possession for 25 years
3) On case she sends a lawyer notice you need to file a fitting reply.
4) It is important to understand the contents of the agreement between your father and hers tho advise you better on remedies available to you.