So far as practicable trustees on the statutory trust for sale, or on the statutory trust for partition, shall consult the persons of the age of eighteen years or upwards and not subject to disability for the time being beneficially entitled to the income of the property until sale or partition, and shall, so far as consistent with the general interest of the trust, give effect to the wishes of such persons, or, in the case of dispute, of the majority (according to the value of their combined interests) of such persons, but a purchaser shall not be concerned to see that the provisions of this section have been complied with.