Tristan Lavin held on to Sage until police arrived and pulled the boy from the frigid lagoon in Margate Sunday.
Police say the brothers took boogie boards onto the bay and were standing on the ice when it gave way under Sage.
A resident's dog alerted her to trouble on the bay and she called police.
Police wrapped Sage in blankets and he was taken to a hospital before he returned home.
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Information from: The Press of Atlantic City, http://www.pressofatlanticcity.com
