In any case where a married man or woman, prior to January 1, 1943, conveyed real property which may have been the homestead of the husband, or the wife, or the family, by a deed duly signed and acknowledged by the husband or wife only, but not signed by the other, and the husband or wife who did not join the other in executing a deed, either before or after, by a deed duly signed and acknowledged, conveys the same real estate to the same grantee or a subsequent grantee, the conveyance by such separate deed is declared to be valid and effectual to pass the title to such grantee or subsequent grantee the same as if the conveyance had been made by a single instrument duly executed and acknowledged by both husband and wife.