The PKK terrorist organization created the Syria-based Kurdish Democratic Union Party (PYD), the party co-chairman's brother said in an interview with Anadolu Agency in the province of Gaziantep on Tuesday.

Mustafa Muslim, a 60-year-old academic at Zehra University's theology faculty in the province, is the estranged brother of PYD Co-Chairman Salih Muslim. Turkey considers the PYD a Syrian extension of the PKK terrorist organization.

About the structure of leading Kurdish militant groups, Mustafa Muslim said that the PKK terrorist group holds "the key" to the structure.

"The main structure is the PKK in northern Syria. The PYD and the People's Protection Units (YPG) are the PKK's sub-branches. The PKK created the PYD and the YPG is the PYD's armed wing," he said.

He said that the PYD represented only 10 percent of Kurds in Syria, adding that there was no democracy in the Kurdish regions of the war-torn country.

"The reason behind the PYD's power is their gun. They arrest people who oppose them and don't want different opinions," Muslim said.

He underlined that although there were 15 political parties in northern Syria, the PYD was considered the only legitimate voice representing Kurds in the international arena. He termed the prospect of a Kurdish state in northern Syria as unlikely "for now."

Speaking about his brother's path towards joining a party that is said to be linked with the PKK terrorist group, he said that PYD Co-Chairman Salih Muslim in the past came to Istanbul to study and later went to Saudi Arabia for work.

"He returned to Syria after working in Saudi Arabia for 10 years; [it was then that he] started to work with leftist and nationalists in our country [Syria]," he said.

Mustafa Muslim lived in Saudi Arabia as well for several years, where he got his education. Later, he was exiled from Rojava in northern Syria by his own brother, current PYD Co-Chairman Salih Muslim.

About Turkey's efforts to help hundreds of thousands of Syrian refugees, Muslim praised the government and recalled how Turkey also helped the people from the Kurdish-Syrian town of Kobani, which is now under PYD control.

"If Turkey had not opened its doors, thousands of Kurds would have died of cold and hunger. The government's approach to the people of Kobani was very honorable. History will record this," he said.

The Islamic State of Iraq and al-Sham (ISIS) attacked Kobani in mid-September 2014, with the town turning into a scene of fierce clashes between Kurdish groups and militants. Kobani has been declared free from ISIS but the city was totally destroyed during the war and about 180,000 Syrian Kurdish refugees remain in Turkey.

Earlier this week, the PYD leader said that his group's military wing, the YPG, received weapons from the U.S.,

Central Command spokesman Col. Pat Ryder denied the PYD leader's claims.

Recently, small groups of Arab rebels reportedly joined the PYD and formed a coalition under an umbrella group called the Syrian Democratic Forces. The move came days before a U.S. airdrop in northern Syria. Ryder acknowledged the formation of an umbrella group, but had deflected an Anadolu Agency question about whether the groups that received supplies included the new umbrella organization. Prime Minister Ahmet Davutoğlu has warned the PYD to not use the weapons reportedly given to them by the U.S. in Turkey. Davutoğlu has said the PYD would be hit like the PKK terrorist group if these weapons ever entered Turkey.

Millions of Syrian refugees have fled their country since war broke out more than four years ago. The U.N. said in June that the number of forcibly displaced people worldwide has "for the first time in the post-World War II era, exceeded 50 million people."

There are now 2.2 million Syrian and 300,000 Iraqi people in Turkey. Turkey is now hosting 2.5 million refugees in its camps.