TRS registration required?

So the property was owned out right by the deceased. The wording in the will instructs the three trustees (one who of which is a remainderman and will inherit the property after the husbands death) to hold the property on trust for life for the husband until he passes or breaks any conditions ie not maintaining the property etc. Upon the husbands death the property will go to one of the trustees (the deceaseds son)

The property currently still in the deceaseds name and assent has yet to be done.