There needs to be a balance. When a child gets married he or she needs to have some level of independence. When your married child does something dumb with money you can offer advice but your child is now an adult and has the right to make choices, even if you think they are dumb.
It can be hard, if for example my child were to go and want to borrow a $25,000 to buy a car or start a business I would very much object. But as long as they didn’t ask me to co-sign the loan I would comment once “I don’t think that is the best idea, here is why…” and then let it rest.
Being an adult means having the right to screw up, and as parents we have to let our children grow up.