My parents are Romanian citizens and US residents, they lived with me in US more then 6 months in 2018,can I claim them as dependents? Is there Romanian income taxable?

They receive social security income in Romania $6000 and $8000, and they pay taxes for this income in Romania. They use this income to pay for their house expenses in Romania. Is their income taxable in US? How do I enter their income on TurboTax?