Rule 3.2. Petition, answer and reply.

 (a)  On or before the return day fixed in the citation or order, and in all other cases within twenty days after service upon him of a copy of any petition, a party opposing the granting of the prayer of the petition shall file an answer admitting or denying the averments of fact of the petition and specifically stating his objections thereto and averring the facts relied upon by him.

 (b)  Within twenty days after service upon him of a copy of an answer, a petitioner may file a reply thereto and admit, deny or avoid the facts averred in the answer.