Como dizer "É da sua conta sim" em inglês

Sugestão:

It is your business, you have to deal with.

You can shirk your responsibilities as a parent/as a true friend.
Here you are just giving advice, trying to "convince" someone else that may or may not have common sense, it will depend on his/her answer to it...that is, it depends on someone´s else moral responsability and conscience.



Now "roughing it up a bit":

I´m afraid it´s your child. (your plan, your task)
You can´t pass the buck on that.
You can shirk your responsibilities, but you can´t avoid it!
Do not think you can shirk your responsibilities, Mr. Vitor!
Don´t kid yourself, if you don´t care! it/this may (or "will") come back and bite you (at some point).



You made the mess, you clean it up!

http://1.bp.blogspot.com/-FDk6RB3_2Lc/T ... bility.jpg



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And many other ways, let´s wait for more.