(Mishnah): Partners, sharecroppers and guardians cannot create a chazakah (as their presence on the property does not indicate that they acquired it from the owner).

A husband cannot create a chazakah on his wife's property, nor a woman on her husband's property, nor a father on his son's property, nor a son on his father's property.

When is this the case? When the property is in their possession; but if they received it as a gift, or the brothers divided it, or a person took possession of the property of a convert (who died without inheritors), if he closed the gate, fenced it in or breached the fence in any way, it is a chazakah.

(Gemara) - Shmuel: Can a partner not make a chazakah?

Question: Did Shmuel not say himself that if a partner entered and planted there, it is as if he was given permission (and no chazakah can be made)?

Answer: When Shmuel said that, it was when his partner was also working in a different part of the same field. (They would customarily do this for several years, switch over for several years and then switch back again.)

When Shmuel was surprised to hear that a partner cannot make a chazakah, it was when the other partner was not present and allowed him to work alone for three years.

Question: Which words does Shmuel have in the Mishnah in place of 'partners'?

Answer: 'Craftsman (working on the property) and robbers (even if they bring witnesses that the owner allowed them to keep it) cannot make a chazakah.'