Percentage take-over and holder/insurer difference – very tricky

Hello first to everyone, I’m addressing you because of a very tricky case: To me: I’ve had a driver’s license for almost 7 years, have been in a wheelchair for about 2 years after an accident (not a car) and get a newly ordered car next week.. Now it’s about insurance. I just wanted the car to register my mother (open service, second car, would start with 60%). Was cheap and top, she would have been a policyholder and holder (only disadvantage I would not have taxed). Now the problem: Auto dealership says that I have to be a holder so that I also get the 20% discount as agreed…And they would indicate that I am a holder 140% of the price 2nd possibility: My uncle has another decommissioned insurance (on which I have already registered n car) with SF11. Then I can be a holder, he policyholder and of the price about 750 €. But now the percent right holder is still my grandpa, who is already dead for over 10 years. The insurance says you have to transfer the % to my uncle (since the rights holder is the VN and holder 3 different persons is too much). But I would never be able to get that then, because it only goes from father-son or just grandfather-angel…But I want the % if I drive long also iwann take over. That I can not completely take over the 11 is clear (max. 7), but do you think I could leave it with my grandpa and iwann try to transfer to me? Or sol l I ask if I can transfer the % to my dad (but who no longer has a driver’s license for years) because I can then almost fully take over the iwann? I thank you already now for your help!!! Begbie