Receiving a terminal illness lump sum will not affect your dependant(s) eligibility for compensation after your death.
Whether or not your spouse/civil partner/relevant partner is eligible to receive PPF compensation, following your death, will depend on the rules of your former pension scheme.
If you leave any children, they may also be eligible for compensation.
Should you take a terminal illness lump sum, any dependant pensions will be calculated on the basis that you attained your Normal Pension Age on the date of your death, and will not be reduced for having taken the lump sum.
Please see our 'Terminal Ill Health' booklet for further details on survivors' eligibility for compensation.