Q. A, B, C, D are the co-owners of a parcel of land. A sold his undivided share to X with the knowledge of his co-owners. One (1) year after the sale, they wanted to exercise the right of legal redemption, but A and X refused. Whose contention is correct? (Solved)

1. They are not entitled to exercise the right of legal redemption because the 30-day period has already lapsed as they knew of the sale;

2. They can exercise the right of legal redemption within 20-days from receipt of written notice of the sale;

3. They cannot exercise the right of legal redemption because knowledge of the sale is not equivalent to registration hence, the 30-day period has already lapsed;

4. They cannot exercise the right of legal redemption due to estoppel.