Why does my boyfriend not take care of his child?

This has been bothering me for a while. My boyfriend of 3 years has a 7 y/o child who lives with his parents. he has no intention of having her live with us. He wants a life with just me and him. I have grown children so they don't live with us. Should I worry about this? We have a good relationship but this bothers me.
Why does my boyfriend not take care of his child?
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