(Mishnah): If a person wrote over all of his property to others without leaving for his sons, it takes effect but the Chachamim are displeased with him.

Rabban Shimon ben Gamliel: If his sons were not acting properly, it is praiseworthy.

(Gemara) - R. Ba bar Mamal: One who writes over his property to others thereby abandoning his sons, the pasuk says about him (Yechezkel 32:27), "and their sins were upon themselves''.

It is like the case of a person who deposited possessions with R. Ba bar Mamal.

He said to R. Ba - if my children are behaving well, give them half and the elderly sage (R. Ba) should keep half. The children came and R. Ba gave them half.

Later on, the children came, claiming that they should have also received the other half. R. Ba said to them - Didn't your father tell me that you only receive the first half if you are behaving well. But now, you are acting like sinners, so you must give back the money!