If the house is circa 1927, spray down the paint chips with water before sweeping. Lead exposure from paint has been greatly exaggerated given the number of smart eighty year old folks walking around today and trying to be or run for President. Lead (and mercury) also makes for a mirror finish on grand pianos. I worked with lead in my vocation, as do stained glass window folks, fisherman and bullet re-loaders. However, before sanding lead, I wore a dusk mask and made sure it was fluid soaked. Wear a dust mask and use a spray bottle filled with water and soap before dislodging it and do the same when cleaning it up. Children eating the chips are the things scary documentaries are made of. Odds are there is lead in the undercoats of your paint, but zero odds you are exposed to it while it is intact and repainted, and then only minutely when the chips fall as only the edges could expose lead paint..