Del. Code tit. 25 § 737
If there is a tenant by the curtesy or other life estate, other than in any undivided share of any of the parties entitled, partition of the real estate shall not be made until the determination of the curtesy or life estate, unless upon the joint petition of the tenant by the curtesy or other life estate and 1 or more of the other parties entitled, in which case partition may be made among the parties entitled, subject to the rights of the tenant by the curtesy or other life estate. If there is a widow entitled to dower in the real estate, other than in any undivided share of any of the parties entitled, partition of her part as the widow shall be postponed until the determination of her estate. After assigning the widow's dower, partition of the residue may be made, or other proceedings had concerning it, in the same manner and to the same effect as if such residue were all the real estate, and after the determination of the widow's estate, partition of the part assigned to her in dower may be made, or other proceedings had concerning it.
25 Del. C. § 737