Does Anyone Know the Poem What happened to Charles It starts with. Now had been brought up with care at number 12 Begonia Square?

The poem you're referring to is "The Lamentable Ballad of a Despondent Duchess" by W.S. Gilbert. Here's the beginning of the poem:

Now Charles Augustus Ferdinand

Was a well-meaning, sensible kind of a man;

He wished to do something to please every one,--

But he never did it, because it couldn't be done.

When first from his tutor released he ran

Like other young scions, a terrible dance of extravagance through,

Then settled as calm as a well behaved man

At Number Thirteen, Begonia Square, Queen Anne style;

And that's why the people were shocked to the core

In his twenty-sixth year when they called at his door,

And saw, on a card by an old-fashioned hat,

These terrible words, "What has happened to that?"