Mother Jessica Kelsey, 17, father George Kelsey, 18, and grandfather Don Baker, 54 have been arrested

Authorities have not said how they learned of the Dec 5 incident, but it may have been videotaped

The two teens and Mr Baker are in jail, the child is in protective custody

‘They packed the marijuana pipe, lit it for the baby and gave it to him and encouraged him to's just unbelievable,’ Chautauqua County Undersheriff Charles Holder told WIVB.........