Convince Grandma for Nintendo Switch?

I know that the switch is expensive, but you know good arguments to convince my grandma. My Wii is broken. The new one is "too old" for me in terms of the model and I would buy it myself or my mother would even give me 100-150 euro. How can I still convince Grandma of that?

Well, you could also use their interests to advantage, for example.

Or just wish it for Christmas. 😇

Are you grandma's darling? Then it shouldn't be so difficult for you, especially so shortly before Christmas.

Convince rather not - persuade would be more appropriate.

There's no reason why "Grandma" could get warmed up for your fooling around. But she could, since she means well with you, get carried away to sponsor something for Christmas.

You might try the facts that have already been described here. With rumbling and flimsy justifications, you will probably crash-land.

Why should you be sponsored this?
You will surely get pocket money, for Christmas also financial donations… With that you can buy the part yourself.

You want something, but don't invest a cent yourself, do you hope that mom and grandma will take care of it?

What do you have in return for mother and grandma for Christmas?

So 1. I want to buy it 100% myself but my mother said of her own accord she would give 100 euro to it now I have to ask Grandma if I should / may really buy this with my money

I have her favorite perfume for my grandma and for my mother it will probably also be a perfume that she does not want to buy herself

I wouldn't convince them. The action has to come from your grandma.