Officials: Man killed brother, family members at mansion

This Nov. 21, 2018, booking file photo provided by the Ocean Township Police Department shows Paul Caneiro. Authorities filed charges Thursday, Nov. 29, against Caneiro, the brother of a man whose body was found along with his wife and children after their New Jersey mansion was set on fire. (Ocean Township Police Department, File)

FREEHOLD, N.J. — A New Jersey tech executive was accused Thursday of killing his brother and the brother’s family as a result of a business dispute and then setting fire to their mansion and his own house in an attempt to cover up the crimes.