Pay Dirt is Slate’s money advice column. Have a question? Send it to Kristin and Ilyce here . (It’s anonymous!)

Dear Pay Dirt,

When my parents died, I became the trustee for the fund they established for my niece and nephew, who are my brother’s kids. To say my brother isn’t good with money is an understatement. He has blown so much money over the years that our parents paid his child support so he wouldn’t lose his license and his kids would be supported.

My niece and nephew are both in their early 20s now and successful with no college debt. I was planning to split the remainder of the trust between them.

Then my brother called, who is in his 50s, called.

He announced that his new girlfriend, who is three years older than his daughter, is pregnant. He says that the baby

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