Many individuals in blended families worry about ensuring their assets are distributed equally between their own children and stepchildren, particularly if they die before their spouse. Standard mirror wills, which are common for married couples, may not provide the necessary certainty to achieve this goal, according to legal professionals.

Once assets pass outright to a surviving spouse, they gain complete ownership. This means the surviving spouse is free to alter their own will, make lifetime gifts, or change their financial arrangements, potentially disinheriting the children of the first spouse to die. This can lead to disputes and unintended outcomes.

To address these concerns, legal experts recommend considering trust-based wills. A common option is a life interest trust. This arrangement allows the surviving spouse to benefit from assets, such as continuing to live in the family home, for the rest of their life. However, the underlying capital is preserved and earmarked to pass to the beneficiaries designated by the first spouse to die. Similarly, investments can be structured so the surviving spouse receives the income, but not the capital itself.

Another strategy is a discretionary trust. These trusts offer flexibility, allowing trustees to distribute funds among a group of beneficiaries—which can include a surviving spouse, children, stepchildren, and even grandchildren—based on changing circumstances. This can be particularly useful if one beneficiary faces financial difficulties or health issues over time, providing a mechanism for trustees to make equitable decisions.

Discretionary trusts can also offer asset protection, safeguarding wealth from potential issues like financial mismanagement, undue influence, or creditor claims. The choice of trustees is critical in any trust-based will. They are tasked with making significant decisions after the testator's death and must be trusted to act fairly and balance the interests of all parties involved. Some families opt for a combination of family members and a professional trustee to ensure both personal understanding and independent oversight.

While not legally binding, a letter of wishes can accompany a trust, providing guidance to trustees on how decisions should be made as family situations evolve. Ultimately, if equal provision for all children is a priority, relying solely on mirror wills may not suffice. Seeking advice on trust-based will structures can help protect intentions while ensuring the financial security of the surviving spouse. It is advisable to consult a solicitor experienced in estate planning to create watertight arrangements that reflect specific family needs and wishes.