Praise be to Allah.
Firstly:
It is permissible for a man to give his wealth to whomever he wishes during his lifetime, but he must treat wives equitably in terms of giving. If he gives a house to one of them, then he must give something similar to his other wife. Please see the answer to question no. 34701
If he differentiates between them in terms of gift-giving, but the other one agrees to that, then it is permissible, because she has the right to do that. But if she does not agree to it, then he must take back his gift or give the other one something equivalent to what he gave to the first one.
What appears to be the case is that both wives agreed to and gave their consent to what the husband gave, without any objection.
Secondly:
Your half-siblings through your father do not have the right to take back a gift that their father gave to your mother or to anyone else, whether they agreed to it when their father was still alive or not, because their father has the right to dispose of his wealth however he wishes, so long as that is not detrimental to the interests of the heirs. This is despite the fact that his first wife, who is their mother, had also received some of their father’s property as a gift, so what may be said about what your mother received should also be said about the gift that he gave to his other wife. So either all the gifts should be taken back and added to the estate, or each should be left as it is; in fact the gifts given to their mother are more problematic, because he gave her more than he gave your mother, according to what is mentioned in your message.
However, what we say with regard to this issue is that it should be referred to the courts, because it is the issue of a dispute between two parties, both of which should be heard in order to establish the rights and evidence of each party.
And Allah knows best.
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