The Grantor of a life estate (the Mom) retains a "Reversion". Simply put, this means the property will revert back to the Grantor (the Mom if still alive) or her estate (if she's dead) upon the death of the life tenant (the son)
A Life Estate is just that, a tenancy for life measured by the life of the Grantee (the son) so the son cannot devise in a will something he will no longer have upon his death.
Answered on Feb 13th, 2014 at 3:10 PM