Idaho Code § 55-203
Successive estates for life cannot be limited, except to persons in being at the creation thereof, and all life estates subsequent to those of persons in being are void; and upon the death of those persons the remainder, if valid in its creation, takes effect in the same manner as if no other life estate had been created.
[(55-203) R.S., sec. 2852; reen. R.C. & C.L., sec. 3073; C.S., sec. 5341; I.C.A., sec. 54-203.]