Transfer the house in Italy, does a

If your husband received the house as a result of a succession, than it is 100 his - and you have nothing to sign.    If he received it in another way and you are married in communion dei beni then it is possible you will have to sign before it is donated to your daughter. Bear in mind that donating a hose to 1 daughter without a donation of equivalent value to the other child (children) is opposable under Italian law, and if she is thinking of selling it withint 10 years it is probably no notary will stipulate the act of sale.