A 2-year-old boy and 43-year-old man were slain Saturday at a home in a wooded area about 50 miles northwest of Philadelphia. The boy’s mother, Kathryn Erdmann, 37, and homeowners Paul Shay, 64, and Monica Shay, 58, were all left in critical condition. Police were alerted at 10:30 pm by a 911 call from Erdmann. No suspects are in custody.