In 1885 he was a founder member of the Men and Women Club dedicated to discussion of the role of men and women in society, and at meetings of the club he met Maria Sharpe. Their marriage in 1890 produced three children; Egon Pearson (born 1895) who followed his father's profession, and two daughters Sigrid Loetitia who was three years older than Egon and Helga Sharpe who was three years younger.
Sa 1885 siya ay isang tagapagtatag ng mga miyembro ng kaibigang Lalaki at ng kaibigang Babae Club alay sa diskusyon ng mga papel na ginagampanan ng mga kalalakihan at kababaihan sa lipunan, at sa mga pulong ng mga club siya matugunan Maria Sharpe. Kani-kanilang mga kasal sa 1890 ginawa ng tatlong mga bata; Egon Pearson (ipinanganak 1895) na sinundan ng kanyang ama propesyon, at dalawang anak Sigrid Loetitia na tatlong taon at mas matanda kaysa sa Egon talga Sharpe na tatlong taon na mas bata.