Is it possible to exchange the damage-free rebates?

I try to explain it as uncomplicatedly as possible: My stepfather (respectively my mother’s husband) has 45 in the HP and 80 in the UK (who once belonged to my real father, but were transferred because of B-tariff from the stepfather, so that my car is cheap…he is now also holder).My (real) father has a discount of 30% each, but currently uses this only for his old VW Polo…now we have the following: My stepfather assures my transitional car with the insurance (or at the insurance office), my father is also insured. We want to “change” the percentages (either during the insurance period or when my newer comes), i.e. my father takes the discounts from my stepfather, in return my father gives his percentages to my stepfather…so a change! Is that possible? I mean, 3 years ago we already gave the percentages from my father to my stepfather…and there existed/is no family bond…is such a ta we know the insurance fuzzi very well, have there all other insurances run (both my father as well as me). So is this generally feasible or absolutely excluded? Hope I have not been too confused now 😉