Brooklyn man finds sister dead with her infant son smothered beneath her

A pair of 6-year-old Brooklyn twins missed school and breakfast, thinking their mom was simply asleep — only to learn that she was dead with her newborn son helplessly trapped underneath her, relatives said.

Marjorie Lyons, 34, died in her apartment on Legion St. in Brownsville. Emergency workers tried in vain to resuscitate 11-day-old Preston while en route to Brookdale University Hospital Thursday morning.

Jerome Guthrie, the mom’s brother, lives on the first floor of the three-story walkup. The twins woke him up about 10 a.m. and Guthrie, 19, wondered immediately why they weren’t in school.

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