“We’re fairly certain he WAS adopted, by his stepfather Lolo Soetoro and became a citizen of Indonesia.”
Unfortunately no adoption papers have yet emerged and when Lolo Soetoro registered Barry at St Francis di Assisi Catholic School in Jakarta, Indonesia in 1967, he listed Barry’s birth place and birth date as Honolulu, Hawaii,and August 4, 1961.
A minor born in the United States does not lose US citizenship. In order to lose US citizenship, an adult has to renounce their US citizenship by an act of renunciation such as surrendering a passport or voting in a foreign election.