If I recall correctly, tenancy of a council house can be 'inherited' - if an adult child is living in the house & the remaining parent passes away the adult child can continue the tenancy.
So, my tuppence worth.
Stay where you are, continue the tenancy as is. Keep your life assurance money - invest it if you wish, go on holiday for yourself (sounds like you deserve it), treat the family to a few days out.
If one of your adult children wants to buy their own home, you can make a gift of some money towards the deposit if you wish; and then leave them at it. You can't control (and therefore shouldn't worry about) what might happen in the future.