“There is no doubt in my mind that my mom is being scammed by a man claiming to be “David Adams,” says Monique.

“I have proven to her countless times that everything he has stated is a lie,” adds Eric, Monique’s brother. “I’ve checked email addresses, phone numbers, hospitals, a residence he owns -- everything he had stated to her, none of it checked out.”

WATCH: 78-Year-Old Admits To Sending Her Life Savings To Online Boyfriend Whom She’s Never Met In Person

The siblings say they believe their 78-year-old mother’s online “boyfriend” is a "catfish" who has swindled her out of her life savings.

“What really hurts the most is that she cares more about “David Adams” than her own family,” says Monique.

However, their mother, Irina, says she’s knows “David” is real and says she will go to her grave loving him. “I want my kids to stop telling me that “David Adams” is a scammer,” says Irina who adds that she’s hurt by her children’s remarks. “My children don’t believe that he is real, but I know he is. I feel it in my heart and I want my family to stop doubting me.”

In the video above, Dr. Phil reviews email exchanges between Irina and “David.” What do they reveal? Does this “David Adams” exist? What will Dr. Phil’s international investigation uncover? This episode airs Wednesday. Check here to see where you can watch.