How do I figure out of I want children?

I'm already 27 and am interested in a serious relationship but don't feel right about entering one unless I know what I really want. I thought spending time with my nephew would clear my thoughts but it just made them more confused. Having a baby around is remarkable with how much they change and grow but it seems like tedious and gentle work I'm not cut out for

How do I figure out of I want children?
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