I tend to do a paraphrasing, but primarily from a genealogical perspective as much as I can. For example, I'll emphasize their parentage, including grandparents if applicable, discuss their siblings, briefly mention the reason they're famous (summary), talk about their marriages, children, and death. To me, anything that links directly to a genealogical artifact makes it more of a family history biography as opposed to the fully blown bio that tends to show up in wikipedia.