Responsa על כתובות 138:5

Q. A demands from B the money his mother deposited with B, to be given to A after her death. B claims that A's mother gave him the money on condition that he return it to her, in case she needs it herself, or else give it to A after her death.
A. According to B's statement, A never gained title to the money since it was not given to him as a gift causa mortis, and he did not perform the formal act of possession necessary in order to gain title to an ordinary gift. His brothers, therefore inherited their share of the money. However, if A claims that he was present when his mother deposited the money with B, and that this money was thus deposited specifically for his benefit, as a gift causa mortis, B must swear that the facts are as he claims them to be.
This Responsum is addressed to R. Menahem ha-Levi.
SOURCES: Cr. 38; Pr. 420–421; Mord. B. B. 592; Mordecai Hagadol, p. 321c.

Q. A demands from B the money his mother deposited with B, to be given to A after her death. B claims that A's mother gave him the money on condition that he return it to her, in case she needs it herself, or else give it to A after her death.
A. According to B's statement, A never gained title to the money since it was not given to him as a gift causa mortis, and he did not perform the formal act of possession necessary in order to gain title to an ordinary gift. His brothers, therefore inherited their share of the money. However, if A claims that he was present when his mother deposited the money with B, and that this money was thus deposited specifically for his benefit, as a gift causa mortis, B must swear that the facts are as he claims them to be.
This Responsum is addressed to R. Menahem ha-Levi.
SOURCES: Cr. 38; Pr. 420–421; Mord. B. B. 592; Mordecai Hagadol, p. 321c.