Not necessarily. A spouse does not automatically inherit everything if the person who died left a valid Will. The distribution of assets will depend on the instructions contained within the Will.
A Will allows the person making it to decide who inherits their estate, which may include their spouse, children, other family members, friends, or charities. While many people choose to leave most or all of their estate to their spouse, they are not legally required to do so.
However, spouses and civil partners do have certain legal rights. If a surviving spouse believes they have not been adequately provided for, they may be able to make a claim against the estate under the Inheritance (Provision for Family and Dependants) Act 1975.
If there is no Will, different rules apply. Under the rules of intestacy in England and Wales, a spouse or civil partner will usually inherit a significant proportion of the estate, but not always the entire estate, particularly where children are involved.
Because every family situation is different, making a properly drafted Will is the best way to ensure your wishes are carried out and your loved ones are protected.