Siehe Wörterbuch: it's your funeral
https://idioms.thefreedictionary.com/it%27s+y...
"it's (one's) funeral
A (usually humorous) threat indicating that if one does or doesn't do something, it will bring about negative consequences.
OK, fine, don't do what Mom said. It's your funeral!
If Billy goes in my room when I'm not here, it's his funeral.
it's your funeral
Also, it's or it's not his or her or my or our or their funeral . One must take the consequences of one's destructive or foolish actions. This expression is used to show one's contempt or lack of sympathy for another's actions. For example, Suppose they do get pulled over for taking a joy ride-It's their funeral, or I don't care whether you quit your job-it's not my funeral. This hyperbolic term implies that an action is so bad it will result in death. [Slang; mid-1800s]
it's your funeral
If you say it's your funeral to someone, you mean that if they suffer bad consequences from something they are planning to do, you will not have any sympathy for them.
it’s ˈyour funeral
(informal) used to tell somebody that they,and nobody else,will have to deal with the unpleasant results of their own actions: I think you’re making a big mistake, but if you don’t want to listen to me that’s fine — it’s your funeral.
