3.—Where two persons have agreed to marry one another and any property is given as a wedding gift to either or both of them by any other person, it shall be presumed, in the absence of evidence to the contrary, that the property so given was given—

(a) to both of them as joint owners, and

(b) subject to the condition that it should be returned at the request of the donor or his personal representative if the marriage for whatever reason does not take place.