Your fathers pension was an occupational pension and the rules stated that it paid out until his death and his wives death.
Your pension is " with Mercer". What does this mean exactly.
Is it an occupational pension administered by Mercer, or a private pension that you set up ?
is it DB or DC ?
In either case, the rules of your fathers pension is irrelevant, you need to find out the rules of your pension scheme.
A lot of pension plans have a death in service benefit, so if you died now, there may be a lump sum. As someone has already said, there may be a lump sum if you died within a few years of retiring.
It may be that when you retire, you can choose what sort of annuity to buy with your pension pot, either for you alone, or you and your spouse.
In general though, pensions are designed to give you an income during your retirement, not an income to pass on to your children.