Can a child(adult) make you invest in their grandchildren fund? And also need my current teenagers signature?

Not sure what you are asking.





Your child cannot make you (force you) to do anything with your money.Can a child(adult) make you invest in their grandchildren fund? And also need my current teenagers signature?
You question isn't clear, but, no, no one can ';make you'; invest in anything.





Nor can they require you to sign something against your will.