Moin people I'm 19 years old I bought the laptop myself but my parents want to take that away from me. Can they even do that?
They can't take your laptop away. If you live in your parent's home or house, they might forbid you to use their power to charge the laptop… Taking away your belongings would be embezzlement.
Can they even do that?
Not legally. But they are allowed to terminate the Internet access and in case of doubt in their apartment even after 21:00 clock turn out the fuse.
So why do you want to take your laptop away and why can't you search for a solution with them in peace?
Per jure they can't take it away from you.
Counter question: what makes them think that they want to do this?
Do you still live at home and pay neither rent nor do you help in the household, not even on request?
Then be ashamed, you parasite. From now on, clean the kitchen every day and clean it neatly, ask your mother if you can do any errands for her (shopping, mail / empties / garbage etc.) and then do it immediately and not "if that Game is over ".
Brush the toilet every Friday from now on (if you still do not know how to do it, ask your mom to stand by and tell you how / what to do), take off the laundry, put it together and clean it get away and hang up fresh laundry.
Keep your room clean from now on, open the window when you go out, so that fresh air comes in and clear used dishes immediately.
Your parents' house is not a hotel and your mother is not your housekeeper.
How about if you get bread rolls for the whole family 8 times on Sunday morning, brew coffee first and then cover a nice breakfast table?
I assume that he deliberately did not write that and will not write.
Excellent!
I would like to add: Learn correct accusative: "my laptop". I'm interested in the opinion of the parents.