Tuhin Shahensha, 27, and Mustakim Jaman, 22, who both lived at home in Portsmouth, hung ISIS flags over their bedroom doors and planned to take their parents to Syria, hoping they would all die together.
However they never followed through on their plans and didn't even leave Britain so they would not upset their mother.
Today at Kingston Crown Court, a jury found Shahensha guilty of two counts of engaging in preparation of terrorist conduct and Jaman of one count and they are facing jail.
The court heard how the pair's middle brother Ifthekar Jaman, a former Sky customer support worker left the family home to join ISIS.
The court heard how the pair's middle brother Ifthekar Jaman, pictured, a former Sky customer support worker left the family home to join ISIS.
He was joined in Syria by five others who became known as the Pompey Lads.
Ifthekar was killed in battle in December 2013 and his death was followed, one by one, by four of his friends over the next 19 months.