Match the cover to the commitment
Consider both immediate costs and the income your household would lose. A mortgage balance is one part of that picture; childcare and unpaid caring work can also have a financial value. Think about how long someone may depend on that support, and take existing savings and death-in-service benefits into account without assuming they will always stay the same.
Who owns the policy and how its proceeds reach the intended beneficiaries matter too. A trust may be appropriate in some circumstances, but its legal and tax effects need proper consideration. Tell the insurer accurately about the information it requests. If you are replacing cover, do not cancel the old policy before understanding and putting the replacement in place.