How can I ensure my wife provides for my son as well as my stepson equally if I die first?

I have a simple mirror will with my wife. How can I ensure that she provides for her son and stepson equally after my death. Both sons are adults and married.Tanya Jefferies, of This is Money, replies: This topic comes up often in questions from our readers, but usually far too late when a family row is already under way.So, you are doing the right thing to prepare in advance to avoid any disputes over who inherits your and your wife's assets, which probably include your family home.The usual way to deal with this is to give a surviving spouse a life interest in any property so they will not be forced to move, but also make absolutely clear who will inherit in the end – in this case your son and stepson.A lawyer who is experienced in this area explains below what arrangements you might make and how to ensure they are watertight.You might want to go back to the solicitor who drew up the original wills, but if not the Law Society has a useful search tool so you can find a suitable firm in your area. Inheritance planning: How do you ensure your own children and your stepchildren are treated fairly (Stock image)Louise Lewis, partner and head of trusts, estates and tax at Freeths, replies: This is something we regularly advise on, particularly as modern families are increasingly likely to include children from different relationships.Many of our clients assume that a standard mirror will guarantees their assets will eventually pass to the people they intend.However, once assets pass outright to a surviving spouse, they belong to that person completely.They are free to change their will, make gifts during their lifetime, remarry or otherwise restructure their affairs, meaning there is no guarantee those assets will ultimately pass in the way originally envisaged.Where making sure both children benefit is a priority, we would often discuss whether a trust within a will could provide greater certainty and protection.A life interest trust is a common option. This allows a surviving spouse to continue benefiting from assets during their lifetime while preserving the underlying capital for the beneficiaries chosen by the first spouse to die.In practical terms, a share of the family home could be held in trust, allowing a surviving spouse to continue living there for the rest of their life while ensuring that share ultimately passes to the intended beneficiaries.Equally, if investments form part of the estate, the surviving spouse could receive any income generated by those assets without owning the underlying capital outright or being able to redirect it through a future will.We often find this approach appeals to clients who are trying to balance two important objectives: ensuring that their spouse remains financially secure while also protecting an inheritance for children or stepchildren.Another option is a discretionary trust. We regularly see these used in blended family situations because they give trustees flexibility to respond to changing circumstances.Rather than assets passing outright to one beneficiary, trustees can decide how and when funds should be distributed between a group of beneficiaries, which might include a surviving spouse, children, stepchildren and even future grandchildren.This flexibility can be particularly valuable because family circumstances rarely stand still. Over time, one child may become financially comfortable while another faces challenges, such as ill health, relationship breakdown or difficulty getting onto the property ladder.A discretionary trust allows trustees to take those changing circumstances into account when making decisions.Discretionary trusts can also provide a degree of asset protection, as assets can remain within the trust rather than passing outright to beneficiaries immediately.In some cases, this can help safeguard family wealth from risks such as financial mismanagement, undue influence or creditor claims.Whatever structure is chosen, selecting the right trustees is crucial. They will be responsible for making important decisions long after your death, so it is vital to appoint people who are trusted to act fairly and balance the interests of everyone involved.Some families choose a combination of family members and a professional trustee to provide both personal insight and independent oversight.Many people also prepare a letter of wishes alongside their will. While this is not legally binding, it can provide valuable guidance to trustees about how they would like decisions to be made as family circumstances evolve over time.Ultimately, if equal provision for both sons is important to you, relying on mirror wills alone may not provide the certainty you are looking for.Taking advice on a trust-based will can help ensure your wishes are protected while also providing financial security for your spouse.