Most married couples, civil partners and long-term partners choose to leave the bulk of their residuary estate to their partner. This is usually due to shared responsibilities like bringing up children or paying a mortgage where your partner would rely on your financial support.
If you’re a parent but don’t have a partner, you may wish to share your estate between your children. Anything left to children under 18 will usually be held by your executors until they reach adulthood. Your executors can choose to transfer the gift to the child’s parent or guardian for safekeeping at their discretion, or to use it for the child’s benefit before they reach 18.