Byron McDonald, II, 28, abducted his son of the same name around 1:30 p.m. Friday from the 2500 block of North Bancroft Street, state police said.
Investigators later discovered McDonald II, and his son were staying at the Aloft Philadelphia Airport Hotel along the 4300 block of Island Avenue where a barricade situation was declared, NBC Philadelphia reports.
Police said McDonald, is a suspect in two homicides: the killings of the boy's mother and grandmother, 6abc reports.
A woman later determined to be the suspect's mother was also found inside their hotel room, police told 6abc.
No injuries were reported.
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